So would a router running pfsense then also become my primary WiFi routers too? Or is it best to keep pfsense strictly as a firewall and have a separate router strictly for WiFi?

pfSense doesn't really do WiFi. So you'd use it as a router/firewall, then have something else do your WiFi. I generally recommend Ubiquiti.

It's worth noting that a 'WiFi router' is usually 3 separate things in one box- a router/firewall, a WiFi access point, and a small switch of usually 4-6 ports. In a home you usually want these things in the same place so they're in one box. In an enterprise, the router/firewall is usually in the basement where there's no WiFi, network switches may be in many places and a tiny one in the router won't help you, and WiFi is up by where the workers are. So it's that sort of setup that pfSense is designed for.

The way I have my place set up- a pfSense machine is the router/firewall. I then use Netgear managed switches (there's a few, mainly GS110TP's), and Ubiquiti WiFi. The Ubiquiti controller runs inside Docker on a small Synology box. Highly recommend this setup.

But I'd just as highly recommend going Ubiquiti all the way. Dream Machine Pro SE is a great base router/firewall, and it has a built in PoE switch so you can hang a few U6 Pro access points off it. You get a bit more flexibility with pfSense but in most home environments it's not needed.