Note: Xface wiki doesn't explicitly mention version 4.20 comes with Wayland support.
https://wiki.xfce.org/releng/wayland_roadmap
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On https://wiki.xfce.org/releng/wayland_roadmap it says:
xfce4-panel and xfdesktop have been ported to Wayland assuming our compositor will be based on wlroots.
xfce4-panel + xfdesktop + labwc is all the 'xfce' I think I'd ever need; so the wayland port is more or less 'done', AFAIC.
(Thunar has been wayland native since the gtk3 port completed a long time ago.)