Well, I believe that its only 65% done.
After Wano there has to be Elbaf Or reverie
then there is the war arc that would be as amazing as marineford and for it to be as amazing, it has to be long right? xD
They also need to visit the 4 islands where the road ponylgyphs are pointing to. and then find the treasure "One Piece". That will probably be the last adventure. which will start after reaching Raftel. then there is a fight vs Blackbeard.
there is so much to cover still. I would say that its only 65% complete Because there is so much that we still don't know. (Vegapunk, devil fruits tree etc)