I think once China give a hint that they have even a prototype of an EUV scanner (SSMB or Plasma, doesn't matter), ASML will step up the pressure in Europe to be allowed to sell their previous generation of their EUV tools in China again. Being in a niche market makes ASML very sensitive to sales. With the mass production of immersion subsystems and machines around the corner it could be worse if the government introduce a quote of SMEE machines for new fabs with government money.
If I remember correctly what I read here, the first SSMB underground facility will be ready for 2024/2025 and it will be mainly a scientific / technological project to make the SSMB concept to work in practice. From that you can expext at least some more years to make it viable in production, and so we are already toward 2030. I have no idea regarding plasma version, at the moment there is not even a prototype. Then there are tons of other issues like resists, masks, etc. that are still to be solved. Finally SMEE currently does not seem to be in mass production even with the non-immersion version of DUV and also its main suppliers are well behind (U-Precision will be ready in 2023, not clear about optical system, etc..).
Considering all the above, I can assume that by 2025, SMEE could be in mass production with immersion DUV (this is not a bad prediction, actually it is very optimistic one). And by the end of the decade toward 2028-2030 there will be a
working prototype of EUVL machine, including needed localization of accessories like resist, masks, etc... Also this latter one is a very optimistic forecast, IMO.