As everything critical happens in real-time–in this “constant-present”–then post-now is by definition outside now-time. For example, if the mess we are now in largely the difficulty of predicting the future(s), then post-now has nothing to do with those futures that matter to us in now-time. Post-now isn’t about such anticipations.
So what is post-now? It’s where you cannot not want to be because you have no need to anticipate anything in being alive there. It’s like a report from a distant planet, wholly like ours, except its present has fast-forwarded in a way unimaginable for us, at least for now.