DaddyTheRunner

We had the customs check on our New England/Canada cruise, except it was in Portland. Had a specific time, I think by cabin number to get in line.  We actually were late, no big deal as it turns out, because the line was moving so fast. They took about ten seconds at most looking at people's "paperwork." After processing I would just head to the tendering deck. If you get to town early, there are a lot of small shops and things to look at while you wait for your excursion. 
Happy cruising!

All itineraries require a stop in a foreign country so at some point the ship will stop in a foreign country.  Upon its first return to a U.S. port after stopping in a another country it will be cleared by CBP.
The same happens in Key West.  If you stop in Key West at the beginning of the cruise you don't have to be processed by CBP in Key West.  If Key West is at the end of your cruise after you have visited another country then you do have to be processed by CBP in Key West. 

Agree with Twangster...you are routed on an almost-continually moving line through upstairs dining room, and briefly visiting CBP officers.  Unless ship docks late, you should be fine with a 10 a.m. tour meeting.

There are so many points of "it depends" to this question but here was my experience on Adventure of the Seas doing customs at Bar Harbor:
https://www.royalcaribbeanblog.com/boards/index.php?/topic/9521-adventure-ots-13-night-snowbird-migration-quebec-to-ft-lauderdale-oct-8-2018/&do=findComment&comment=87666
We arrived at 7am and I was processed by CBP and on the pier by 9:10am.  
CBP comes to the ship.  They can be quick to arrive or they can take their time so it is variable but 10am would have worked fine for me on that day.  
They will post a schedule of when you are to appear at your designated meeting point to see CBP.  I think I was in the MDR.  As they are calling groups you can predict when your group will be called based on timing and queue up at the tail of the last group.  If things are slow on your day you should be able to talk to the crew and request going ahead of your time.  The times are simply a means to avoid thousands of people all trying to queue at once, CBP really doesn't care if deck 8 comes before deck 7, cards are swiped until they have processed everyone.

I work in jeans and steel toe boots, so while I may complain a bit, I really enjoy having a reason to get dressed up with my wife.
 
The last formal night we were at I wore a pair of dress pants, a long sleeve button up shirt, fancy shoes (that I bought for the cruise), and a tie.  I had to look on YouTube while we were getting dressed to remember how to tie the tie.
I clean up good.  ? 

If you think you might want the photo package, I would go ahead and grab it at the sale price.  You should be able to cancel it later and get a refund if you have second thoughts.  However, you won't be able to go back to Black Friday if you later decide you really did want the photo package.

If you think you might want the photo package, I would go ahead and grab it at the sale price.  You should be able to cancel it later and get a refund if you have second thoughts.  However, you won't be able to go back to Black Friday if you later decide you really did want the photo package.

Warning
I just noticed that for my sailing (Adventure of the Seas, July 2020), the Black Friday preview page is showing the "normal" prices (i.e. what they were earlier this week.  However, when you navigate to the specific package section (i.e. drinks page or dining page) you get to see the reduced Black Friday prices.

Only one cabin for the four of us, it will be cozy.
The expense is not an issue because they are about $2 per bottle.  My plan is to put one in each of the kid's carry on bag.  Then whoever wants to confiscate them will have to take them away from a kid.  I'm not above playing on their emotions and I've prepared the kids for the potential confiscation and they are on board for trying to bring them on board.  And it's not like we are trying to avoid buying the soda package for the kids because we've already decided to purchase that for them which will be a mega treat for them since they only get to have soda a handful of times in a month.  I just know our kids enjoy having "kid" wine on the rare occasions when Mommy and Daddy are enjoying adult wine.

I kinda got an answer from Royal Caribbean earlier this week.  They responded to my question without actually answering the question I was asking.  They simply reiterated their 12 x 17 oz (500ml) limit for non-alcoholic drinks without specifically addressing my question of bringing on two slightly larger bottles.  I guess we'll see what happens when we show up on embarkation day.
Here's a copy of their response:
 

I just sent the email asking about if we can bring on two bottles of sparkling juice.  I'll share the answer I get when I receive it.

I just sent the email asking about if we can bring on two bottles of sparkling juice.  I'll share the answer I get when I receive it.