I don't think that via cli you can get the output of the APs serial numbers, GUI is your best bet.
Here is the Syntax
show wireless [ap|client|domain|mesh|meshpoint|radio|regulatory|sensor-server|
unsanctioned|wips|wlan]
show wireless ap {configured|detail|load-balancing|on }
show wireless ap {configured}
show wireless ap {detail} {} {(on )}
show wireless ap {load-balancing} {client-capability|events|neighbors} {(on )}