Board Thread:Anime/@comment-5774380-20190630165114/@comment-5774380-20190630170451

Yes, this strongly implies that the manga is ending either this year or at the beginning of the next as we guessed since Isayama revealed that the current arc is the last.

Given that arcs usually span 16-20 chapters, the most likely dates are either this October (Chapter 122, Volume 30), or February 2020 (Chapter 126, Volume 31).

It'd be too rushed for the manga to end in 3 months so my bet is the latter.