Here's the thing: There probably won't be a solidly marked endpoint to the isolation. It will ebb and flow, but we're unlikely to have officials hold a press conference and say "Okay everyone go out and play again!" It'll be piecemeal, county by county, city by city, as people decide the worst might be over. And even then, resurgences will occur until we have a proper vaccine, so isolation will have to be repeated on small or possibly larger scales for the next 18 months or longer until that vaccine arrives. And then everyone has to get vaccinated and then, maybe, we get an announcement that the virus is effectively controlled. But I doubt anyone will want to take responsibility for being the person who says "All clear" on this.
What would be a more effective solution, but I doubt will happen, at least in the US, because it would require too much organization, is to achieve widespread testing to determine who has it, who doesn't have it, and who had it and now has antibodies. Then you'd have to mark the survivors somehow with a wristband or ID card of some kind, and those people could go back out into the world and to work and all that without fear of spreading the virus further. Everyone else who has it would have to self-quarantine and anyone who didn't have any signs of having it would have to continue to social distance from non-immune people until a vaccine was available. Sort of an administratively managed form of limited herd immunity. However this feels real fucking dystopian so it's unlikely people would be on board with it, despite how effective it would be at getting some things back up and running in the interim between the peak of infection and the availability of a vaccine.