So, I assume that as Rambeau comes out of the snap in the hospital, Scarlet Witch (Wanda) and the other avengers are coming out in the battle field via the end of endgame.
But, Rambeau seems to get her assignment very quickly to go to Westview to investigate what's up. Wanda is already there and has been there.
So whatever happened to get Wanda /Vision there had to happen quite quickly and maybe even simultaneously after/with the end of Endgame.
The mid season trailer seems to indicate the TV sitcom reality in Westview was created for Wanda not by her. She also says at one point in it that she doesn't know what is going on.
It appears too Vision will try to leave to see what is outside the town. Will his lifeless body collapse outside the barrier? Will he still somehow be alive?