It does seem like it is absent from Beta 3. In Beta 1, I had added it to Control Center but at some point in time since then (Beta 2/3) it was removed, it seems

It does seem like it is absent from Beta 3. In Beta 1, I had added it to Control Center but at some point in time since then (Beta 2/3) it was removed, it seems. Not exactly a promising sign. Edit: it seems that the feature only appears when AirPods are in proximity. Seeing it in Beta 3 now that I’ve gone home and am close to the AirPods.