Add this Repo as root with:
Code:
zypper ar -f https://download.opensuse.org/repositories/home:/Sauerland:/hardware/openSUSE_Leap_15.2_Update Sauerland-update
Install the driver:
Code:
zypper in -f rtl8814au-kmp-default
Reboot and config your network, I would use for Wifi NetworkManager.
If a new kernel is released, you will get the driver automatically a little bit later.