Dear friend,
I am currently using FreeBSD 15 together with the TP-Link Archer T2U Dual Band Wifi adapter. This one is usually inherently supported and automatically detected by the rtwn_usb kernel module.
If the system doesn't load it at boot time, you can manually load the required module as follows:
kldload if_rtwn_usb
Then you have to type ifconfig -a to confirm that the adapter is identified. If it has worked as expected, the computer should identify it as rtwn0 or something similar.
Finally, you can instruct the operating system to always load and activate the device at boot time, by adding the following two lines to your boot loader configuration file, named /boot/loader.conf
if_rtwn_load="YES"
if_rtwn_usb_load="YES"
Hoping that this answer helped a bit,
Best meowing regards to all FreeBSD users,
A humble White_Cat from Greece