See the attached link for chart illustrating the expected commercialization and construction of such power plants (e.g. Small Modular Reactors, High Temperature Gas Cooled Reactors and Sodium Cooled Fast Reactors).
The Nuclear Regulatory Commission (NRC) is also implementing Licensing procedures/requirements appropriate for those designs...see link below...
https://www.energy.gov/ne/articles/nrc-approves-new-approach-streamline-advanced-reactor-licensing-process
Basically, we're looking at the early 2030's for these reactors to come onto the grid...just want to set expectations for you...questions welcome.
btw, it is unlikely you'll see any U.S. utility order a current generation Light Water Reactor (PWR, BWR) in the meantime...best case is to keep as many of them operating as possible until the new designs are ready....will need to make do with Wind/Solar/Hydro and as little FF Powered plants as necessary to maintain economic progress.
Link: https://inldigitallibrary.inl.gov/sites/sti/sti/Sort_7242.pdf