For Act Three ending next chapter, or indeed any time soon, consider me doubtful.
The purpose of the Act structure has been to separate Wano into, essentially, it’s own self-contained mini-arcs within the overarching Wano arc, with their own plotlines to be resolved and ended during the course of the act. That allows Oda to use the interludes to skip over some time in Wano, giving us some information on what is happening in the rest of the world, then get ready to cut back and start new plotlines in Wano.
Look at the ending of Act One. Luffy accomplished his goal of freeing Bakura, but is tossed into jail having been defeated by Kaido. The Bakura plotline was over, his new one ready to begin. Everyone else in the alliance is floating plotwise, Oda yet to really set them up with anything. Oda can thus cut away from the action, then begin afresh with Act Two, having skipped some time on Wano in-series.
Act Two, the self-contained story of the preparation for the raid. Udon is liberated. Zoro gets his new sword and rescues the princess. Kid and Law are freed from prison as well. The Scabbards are on the move. The Alliance have gathered men, arms and ships. Kaido and Big Mom have formed an alliance. Again, Oda can cut away from Wano, take a few days from Wano, then go back ready to start again.
A defeat on the rooftop- which is very likely, albeit a temporary one- does not fit this structure. There are still loads of ongoing plotlines, which the rooftop fight does not effect. Kaido temporarily putting all the Worst Gen down for the count does not have any effect on Jinbei vs WW, for example. None of the previous acts have ended mid-action.
Now, obviously there’s nothing stopping Oda from thinking “you know, this is a good time to cut away from Wano, I think I’m going to do that now”- but it’s not how he’s done it with the previous two acts. If he cut away now, Act Four would be starting immediately where he left off, not like previously where he took the off-panel time between Acts to move the story and players around.
Barring the nonsense suggestion of the Alliance losing completely- which would be by far the dumbest thing Oda would ever have done- I’m not seeing Act Three end until at least every fight bar Kaido are over
Again, assuming he sticks to the idea that he won’t finish Act’s mid-story. If he is going to do that now, I suppose this is a fair time for it. Can maybe use the ten minutes as an interlude, but that seems a bit... brief.