I use a wired connection for the XBox One X and the Switch. Does WiFi 6 actually offer faster speed than a wired connection now?
Now, if you have a WiFi 5 router, it doesn't matter if your console(s) have WiFi 6, as they will work in WiFi 5. On the contrary, if you have a Wifi 6 router but only WiFi 5 devices, you'll be wasting the router's capability.
For WiFi 6 to be fully utilized, both the router AND the devices have to be WiFi 6 compliant.