Hope that Oda doesn't focus too much on searching for Kaido's son,because battle is about to start.
Lol, its cute you think the battle is about to start. Reminder that Dressrosa was the last actual battle arc we got (WCI was an exception and very unorthodox to how Oda does act structures and its essentially setup for Wano's main battles anyway) and Dressrosa went like this:
From Chapter 745 (the moment Doflamingo did Birdcage) to 762 (before Law's Flashback), this was all setup to get everyone to their respective places for battle or to begin the "skirmishes" portion (where people just fight but nobody is defeated at all). 17 Chapters.
Then he did Law's flashback from 762 to 768 (~7 chapters). Only then after this, from 769 to 779, did Oda write 1-2 chapter finishing battles for each character. Then only after this, did Luffy spend nearly 10 chapters fighting Doflamingo. Nearly 50 chapters of setup, additional flashbacks and fighting before it was all over. Take away Law's flashback and its still 40 chapters of pure setup/battles.
Now compare Dressrosa to Wano. We are at 71 chapters in Wano, and by this point, Hajrudin and Sai already defeated Machvise/Lao G. We've barely begun the infiltration into Onigashima, and we are still being introduced to Kaido's crew (Yamato, Numbers and the possible "Ace" still yet shown). Wano also has nearly 3x the amount of important characters in it and a lot more perspectives to focus on.
Currently we aren't even at that "birdcage" moment of the arc, we are the part before where Luffy/Usopp and Kyros sabotage everything, kind of like how the alliance is crashing the party. We have to get to THAT point, then Oda needs to setup all of the battles and have the skirmishes first (people just don't fall in one hit usually, unless you are Bellamy). So we aren't even at that ~17 chapter span where Oda set up all of the DR fights. Then you have to account for the fact that Kaido/Big Mom have unexplored history with Rocks or Kaido's lineage, all likely to be a flashback before the final battles begin or around that point.
This is going to take longer than anyone thinks, and I will be surprised if even one significant Beasts or Big Mom Pirate goes down before the end of the year (not including lesser BM children/headliners or fodder), due to all of the actual setup Oda has to do with nearly 60 characters this arc.