I'm sure Wayland works in general, but every 6 months I try Wayland/KDE and I have yet to successfully start up the desktop.
Mutter is still buggy on Nvidia but I believe KDE should work fine these days unless you're on a distro that doesn't have recent drivers.
With nouveau, it works for up to a minute before freezing and locking the GPU.
I'm not so sure whether this is an nvidia issue or an SDDM issue.