For those stressing about their arrival status, or are having problems with the pre-cruise part of the app, all I have to say is "Don't worry about it". Here is our check in experience for a 14 day cruise the just got back last weekend (left and returned from Port Everglades, Ft Lauderdale):
Without going in detail, we basically were unable to do anything using the app to prepare for check in. Since we didn't have an arrival time, we showed up at the terminal around 10:30 am. We went through the Platinum line which really only gives you priority getting to the metal detectors, I don't think there was anyone in front of us. We were in the blue lane, since we couldn't do anything in the app, and walked right up to the long counter with no one in front of us. The rep processed our docs and we were on our way. We just had our travel itinerary (that was not really needed), our passports and vax cards. Interestingly enough, the rep never asked us for our negative Covid results. Ironically, the lines were much longer for the kiosks in the green lane.
We then waited in the Platinum "lounge" which is just a waiting area in the terminal. The Platinum and Elite all were allowed to board before the rest of the guests though.