The aim of the color management extension is to allow clients to know the color properties of outputs, and to tell the compositor about the color properties of...
KDE, Gnome, Gamescope and now Wlroots already have a working implementation of the protocol.
Weston implementation seems still in progress:
https://gitlab.freedesktop.org/wayland/weston/-/issues/467
Anyways, proton 10 when