You can use the command "get airtime wifi1" or "get airtime wifi0" to check the airtime utilization of the radio.
Below is the sample output of how it looks.
get airtime wifi1
Total: 25 19
Busy: 3 3
Tx: 1 1
Rx: 21 15
They indicate time spent by the radio in receiving the data (which is RX), in transmitting the data (which is TX), and percentage time wasted due to non-WiFi signals (which is Busy) in the operating frequency band.
High RX percentage values above 30% indicate too much co-channel interference or a misbehaving client.
High Busy percentage values above 30% should also be concerning as well because this percentage takes out the time from servicing the clients.