It peaked at 4.05% in March. The last 2 months it went just below 4% as the Unknown category increased. For June the reverse happened, so 4.04% seems to be the real current share of Linux on Desktop as desktop clients were read properly/werent spoofed.
Mint should have Waylant support if you don’t use Cinnamon; I know Xfce has Wayland support (though I don’t use it, they can pry X11 from my cold dead hands)
atm Mint only has experimental wayland support, i tried it an got instant graphical issues on the desktop. :(
Neither Cinnamon, XFCE or Mate have stable Wayland support. You need GNOME or Plasma for that if you want a desktop (or wait for the new Cosmic desktop and new PopOS)