At 4K the main load will be on the GPU then again, as it was mention already, it will also depend on the game engine and age and graphic settings. If you also plan to increasing graphic settings to High with the 3060TI, then you should be fine with a i7 7700.
Is this i7 7700 a K model, or just i7 7700?
Testing what Geofelt wrote will help you figure out if the CPU still have some extra room for a better GPU. For example get a game you run at 4K, lower the resolution to 2K (1440p), keep same graphic settings and see how the FPS counter goes.