I didn't manage to setup WOL (Wake on LAN) from my iMac running 10.13.6.
I do have Wake for Network access enabled from system preference / Energy Saver
I did enter the ethernet MAC (and not the airport one)
I have this setup on my router (Synology RT1900AC), when I manually turn on my iMac, the router detects it and there is a lightning cable next to the MAC address (but I guess that maybe just because the network detect some packet from this MAC ...)
Is there something else I'm suppose to do in order to have WOL working?