[zeroz]

Settings > Bluetooth > Your AirPods (click on [i]) shows the version, even if AirPods are not actively connected.

6A326 seems to be the version including the fix.

https://support.apple.com/en-us/HT214111

[mh-]

>AirPods Firmware Update 6A326, AirPods Firmware Update 6F8, and Beats Firmware Update 6F8

I'm on 6F8, which I presume is for AirPods Pro 2nd gen.