The Snap clearly hadn't happened in any of the seasons of Marvel Television shows released after Infinity War. This means that they are either not (or no longer) set in the main timeline (as is clearly the case with Agents), or that they are in fact set before the date of the Snap (which is my view for all the shows besides Agents of SHIELD).
But the timeline pages (particularly looking at 2018) on the Wiki show the last seasons of several shows as taking place both after the Snap AND in the main timeline. How can this be? Or am I misunderstanding something?