Because of pandemic driven shortage, I wasn't able to finally play ER until about version 1.07? So, it had been out probably about 10 months and most of the performance issues early on were already patched. Though, it's still not perfect, at least not for me. At 4K with RT off and everything maxed (running i5 12600KF OC'ed & 3080 12GB OC'ed), I generally get 60 FPS for about 90% of the game? The notable exception were some boss fights, e.g., Godrick's flaming dragon head spam.
The DLC had some areas where the FPS dips, the area where you approach the Shadow Castle & PCR's Star Wars light show. Other than that, I think it's mostly 60 FPS, and I assume should I upgrade to the AMD 7800X3D & 4080, I'll get 60 FPS with RT on and max settings, at least for most of the gameplay. If the PS5 Pro is incapable of improving ER, then I'll wait until they actually have a game I'd like to play, and Wolverine is the only one. I'm not a GTA fan and none of their live service titles interest me in the least.