Well, it's kind of hard to give an exact measure. But the anime has made good progress and has adapted quite a few story arcs from the manga. There are still many exciting parts in the manga that haven't been animated.
Well, it's a bit tricky to say exactly. The anime has made decent progress, but it's not caught up completely. Some key storylines and developments from the manga are yet to be shown in the anime.
The JJK anime ends at a specific point in the manga that varies depending on the pacing and adaptation decisions. You'll have to look closely to determine exactly where.