Complex question. The stage of socialism that China is at? Or when it will fall to a revolution?
I think it's kind of pointless to try to estimate further than the next qualitative change towards socialism (so, revolution), so I'm just going to put my answer for the revolution ETA.
And that is I have really no idea. None of us do, but if you are on the ground involved with an organization and engaging in the work as we all should be, you'll see that things are far worse (conditions wise) than even a year ago. People are struggling and unhappy. Revolutionary tinge is growing.
This election year is going to be hell at the end, and I wouldn't be surprised if things got significantly worse before the next inauguration. We just saw the insane SCOTUS ruling(s). Maybe something big happens in 2025 and succeeds, maybe it happens and is quashed and pushes back revolution for another few years.
The only thing that is very clear is that this cannot go on for much longer. I truthfully cannot see this country surviving status quo for another 10 years. It either will devolve into total, mask-off fascism (more than it is already, talking Nazi shit) or we will get done what needs to get done. But this will end soon.