In-kernel WireGuard is on its way to FreeBSD and the pfSense router
arstechnica.com
WireGuard probably won't make it into 13.0-RELEASE, but 13.1 seems very likely.

Very nice. I use OPNsense on an PC-Engines APU4 and are super happy with it. But I never quite managed to get Wireguard to work with it. Maybe this will help :)