My Pro 2s did update to 7A294 after I followed the usual rigamarole - listen to some music through them, put them back in the case and close it, put the case near the locked iPhone (on iOS 18 RC), and leave it all alone for “a while.”
I have not found a way to initiate a hearing test yet in either the AirPod section of Settings or in the Health app. Perhaps that feature is still to come in another update later this fall.