4790 + 3070 would probably be fine for cross-generation games at 1440p. Not sure for games built around PS5/XSX since they're 8-core/16-thread Ryzen and have much faster RAM/SSD, but you could always upgrade the rest of the system later if needed. It will probably be more difficult to maintain 60fps as time goes on. Even for something like Cyberpunk I'm not sure if 4790 will be enough for a consistent 60fps. I'm in the same boat (4790 non-k + 1070) and am waiting to upgrade everything in one go.
Gamers Nexus did a video on 4790k/4690k + 2080 ti back in late 2019 if you want to see how it compares to newer CPUs.