A KDE developer made a blog post on the 21st talking about X11 stats on KDE and the numbers show the majority are already on Wayland.

At this point in time, our telemetry says that a majority of Plasma users are already using the Wayland session. Currently 73% of Plasma 6 users who have turned on telemetry are using the Wayland session, and a little over 60% of all telemetry-activating users (including Plasma 5 users) are on Wayland.