FWIW, I measured at my current mileage of ~5100 miles using a depth gauge which costs all but $3.
The front depth was just at 8.5/32nd. The rear depth was at ~7.5/32nd. These tires new come at 9/32nd.
The rear wore out ~3x faster than the front, and I have an AWD. so I rotated them. It's a 45...