Doom'16 had a min spec of a GTX670 a GPU that was
4 years old at the time
(I dunno if a 1.2GB GTX570 was enough)
Doom Eternal had a min spec of a GTX1050Ti/1060 a GPU that was
4 years old at the time
(much older was not advisable due to VRAM)
Doom Dark Ages has a min spec of an RTX2060S a GPU that will be
6 years old at the time
(8GB VRAM likely the actual reason its not a base 60)
So looking back this is the oldest GPU Doom has supported as a min-spec in the new generation.
If I would be so bold as to hazard a guess if you have anything 3060Ti class you are gonna be running the game in the 90fps range at "Supreme" settings.
If you are at minspec then 60 should be no problem.
VRAM is gonna be our biggest enemy i would guess.
P.S What GPU are you using to run Doom Eternal at 4K120 and at what settings?