I’ve noticed that nm-applet is included in autostart.conf, but a fresh install does not include this package. It would be nice if a fresh install of CachyOS/Hyprland included this package so that the applet shows on waybar.
I would actually be very interested in submitting a PR for this myself, but I would have no idea where in the CachyOS Github I should look for fix this. 
The package in question is located here in the AUR: Arch Linux - network-manager-applet 1.36.0-1 (x86_64)