Changes little, the theaters are full and are adding rooms for previews (very unusual in Italy). I am practically certain that it will beat (maybe a little) OD by Infinity War (2.9M)
Small curiosity, the "UCI" cinema chain (the largest along with "The Space") had made 10k gadgets available (one per ticket of course) for the preview of "Endgame". They are finished after 3/4 days
The presales in my city (Verona) are very high. The preview is sold out at 90%, the day after the afternoon screenings are at 25% while those at night over 50, but both growing