There's growth and there's growth. We're probably starting to bump up against ecological limits to the number of humans we can have on this planet ("carrying capacity"), though we might have yet another agricultural revolution get us past that limit. Until then I do think we're near peak population (and indeed, projections already bear this out, and in many countries so does current data).

But we're probably quite far from hitting limits to economic activity. Even when we hit limits for physical economic activity, as you note, there will be virtual economic activity. So I think as far as economic growth goes, we're probably very far from hitting a maximum.