What section of the 2016 Berserk anime is covered by the 3rd movie, The Advent? I want to know what episodes of the anime that the movie covers. Take
movies 1 and 2 which cover episodes 1-20.

I've heard the third movie covers episodes 21-25 and X episodes of the 2016 anime. And so I want to know what those X episodes are.

I'm not asking for anything plot-wise, I just want to know how much of the 2016 anime it covers.
As far as I can remember, the new anime doesn't cover anything the movies covered and vice-versa (unless flashbacks and recap episodes). I think you're thinking of the original show and the movies overlapping.