I'm steadily working my way through the challenges and collectables of the RDR2 world while I have chapter 5 on pause (I'm basically ignoring the main story mission for now).
There's a bunch of stuff/land to the west of Blackwater that's currently blocked off to me, so I assume that I can carry on with my challenges later on in the game.
Is there a point in the game where the challenge/collectable strands of game completion stop, or can I carry on with the story until completion and carry on with the challenges after that?