Fingers crossed Act 3 ends next chapter. I believe A3 hits its 45th chapter
IMO not at least until 1006-1010 because of breaks we had about COVID...
I would be too surprised if the Act III ends before chapter 1006 (and I would be very happy too!).
So... Something big/interesting or whatever must happen in the upcoming chapters as a set up for the end of the Act III like New Onigashima being officially announced to all Wano citizens, Kaido and Big Mom showing their true powers to the Supernovas and maybe crushing them this time, the alliance being defeated (I can't see this happening with Marco here... So no), or an external party arriving to Wano.