It’s very good.
Basically, there is one maintainer in the AUR (the name escapes me, jonathon I think it was?) who applies the necessary patches to the old NVIDIA drivers to make them run with a modern Linux kernel.
Of course, there won’t be any Wayland support, but the experience is acceptable as long as you temper your expectations in terms of graphics API support. (No vulkan sadly)
I hadn’t used it myself but I know a person who does and loves it. iGPU handles Wayland stuff while the NVIDIA is there for the heavy lifting in Xorg.
I probably misremembered something then, 390xx it is then.
But whatever it may be it is in the AUR 100%.