Decided to look up what movies are filming right now (at least according to IMDb), so we can pinpoint what's going to be delayed:
Pre: Shang-Chi (though apparently set photos are also up. Maybe IMDb lied to me), Uncharted, Doctor Strange 2, Indy 5 (IMDb just says announced, but I'm pretty sure it was expected to film in April), Spider-Man 3, Thor 4, Fantastic Beasts 3, Black Adam
Filming: Cinderella, Matrix 4, The Batman, Jurassic World 3, The Batman, Elvis (though I'm sure production is going to halt soon), Avatar 2 (thought it wrapped already, but whatever)
Post: Fatherhood, Mortal Kombat, 355, The Little Things, Cruella, Space Jam 2, The Suicide Squad,
Production halted: Mission Impossible 7
Animated movies are harder to pin down, but I'm sure a lot of studios are telling their employees to work at home by this point, which is probably difficult but not impossible production-wise. We'll see if some of those movies make the date