We boarded in Brooklyn on May 15. It didn't make a particle of difference what time your boarding pass indicated, what tier (diamond, platinum, etc) you were on, what cabin assignment you had. Just go to the end of the line that stretched around the block (so to speak) where the checkers re checked every scrap of paper you had. It didn't matter if you had printed out all of the health forms, etickets, boarding passes, etc. You had to go thru another enormous line to even get to the actual check in.
We went thru this same mess in Feb. and chalked it up to the QM2 entering the US for the first time since covid. Nope, still the exact same mess in May......go figure.