Hm... So, it seems the things will go like this before act III ends:
- We need Sasaki display/backstory with Denjiro.
- The same above for Black Maria.
Then, we will pass to Fukurokuju and Basil Hawkins.
Later, to Jack and King (this one last).
Finally, to Big Mom with some plots to Law (unknown for now) and Kid (treasure thing).
Act will probably end with Yamato's DF reveal or some backstory/plot and Luffy coming to the roof again (Luffy and Yamato vs Kaido).
CP0 and Orochi plots will be saved for act IV or Wano end.