DLSS 3 should double your lowest FPS. MSFS will likely still say you are CPU limited because that is still what is limiting your performance, but who cares if you are getting double the FPS? Something has to be limiting performance anyway.
BTW by how much is your current performance being limited by CPU? ie. what are your mainthread and GPU frame times? I’ve found the biggest cause of CPU limited scenarios is people running too high a TLOD. I run TLOD 200 in 2D, because I have a 5800X3D and 4090 that can handle it, but in VR I run TLOD 100 to only be rarely CPU limited and I can’t really tell the difference when flying normally anyway.