I already covered OpenVPN configuration on pFSense server, and you can read more about it here – https://www.informaticar.net/how-to-setup-openvpn-on-pfsense/
This is tutorial where I will be describing client part of the OpenVPN installation. Once again this short tutorial is targeted for the OpenVPN installation on pFSense.
This tutorial is addition to the OpenVPN configuration on pFSense which I linked above.