Proof of vaccination
Passport
Negative Covid test which can also be on your phone
Medallion
I also print out my travel summary which lists perks, excursions, flight info etc.
I didn't have to even show my app for my last 3 cruises. They really didn't pay any attention to your boarding group unless you are Elite, Platinum or in a suite where you have a separate waiting area after you stand in line with everyone else.