https://www.cnet.com/news/when-to-pee-during-avengers-endgame/

This scene is just over an hour into the film, and while it's amusing, missing it isn't a dealbreaker (in fact, you may escape some cringe-y silly moments). The next 10 to 15 minutes after this scene is the safest window to empty your bladder.

There are no good spots to pee in the last hour of this film.