I dunno, I don't think it'll do well in theaters.
Trying to take off from where the show was and expect people to pay up to see it in theaters rather than just wait until it's streaming alongside all the rest of the MCU seems dubious.
Tbh, I can't see any of the characters that moved to series doing well in theaters as individual movies. I'm not even sure people would go if it was supposed to be all the ? -remaining movie avengers moving the "universe" forward to a next stage.
Right now, it's all fractured, and Thor is probably the only one left that could pull big numbers into seats simply because he's the only one that hasn't switched formats.
Spider-Man could, but he's also not a TV/streaming immigrant, nor is he as constrained by the MCU aqs a whole, as far as audiences are probably concerned.