Certainly, we aren't there yet. Do you want to be the guy trying to hitch an implement to an autonomous tractor backing up? What if it doesn't stop? Also, what if your kid runs out in the field in front of the tractor? Finally, how do you transport the tractor and the implement two miles to your next field?
Overall, the method of a tractor with a person driving pulling an implement has not changed in decades, it is an industry ripe for disruption.