Yep, the rear is toast, but I've seen worse. On separate trips, when I 'used up' my Metz-4 and Pilot Road, once the first wear bars were down similar to what you show in the pix, those tires were to cords in a few hundred miles. But my Avon showed hard for a couple of thousand in the late stages, very slow wear in the late innings. I suspect that is one reason why the Iron Butt riders tend to favor the Avons.
Regarding the front, I'm mulling over MarkJenn's position, who thinks we try to milk too much out of the front tire. Is it worth the uneven wear and handling for a couple thousand extra miles on the front? Can folks get 2 rear tires use for 1 front?