There is: Turn ON Dev Mode and select show FPS. You will get all the performance from the GPU/CPU.
To tell you the truth, even a 3060Ti / 3070 would be enough if you are not playing 1440p or above.
A 3060 would do the job for you, to get much better FPS. I dont even think you need a better CPU.
RTX 3090 is not need, said for fun. My 3080 still only uses around 6-7gb of memory with everything ULTRA, but im playing on 2k not 4k (Yet)