It already shows encryption status (yes/no, not the standard used) in the first column - letter P means protected(?).
Unfortunately it can be sorted/filtered by this column.
Perfect functionality will be Filtering/Sorting feature using all fields available:
Encryption, Signal, Noise, S/N and so on.
I use Metal 2SHPn on my sail boat (installed on top of mast /17m/ with 10dB Omni) to connect to APs while in marina/anchorage.
Very often can see nearly 100 networks, looking for usable one takes time without filtering option.
UBNT Bullet 2HP I also use allows sorting by encryption and shows standard used (WPA/WPA2 and so on) like this: