Considering Kaguya's, Hamura's, and the Shinju's full back-stories are still yet to be revealed, I can see this fight with Kaguya easily lasting another 10-15 chapters. Then there's the matter with Naruto and Sasuke's final fight. My best estimation... the manga could end around chapter 730.
They're definitely having their final fight. It may not be a death match anymore, but they're still gonna fight. It's been foreshadowed all throughout Part II.
He wants to be Hokage, so does Naruto. There's your fight.
Yeah, that should be a hint on what kind of fight it was.