There's still a long way to go. There are myriad tasks truckers take care of besides driving the truck. Small repairs, paperwork at both ends, balancing and certifying weight, changing the route when necessary, refueling, loading and unloading, security, and not least important, monitoring trucks on the road for problems. If an automated long-haul truck breaks down in the middle of nowhere that's going to be an expensive fix.
I'm predicting no more than an initial 30% loss once the driving is fully automated .(because teams will be cut down to one driver) And a lot of truckers own their own trucks, meaning they do all the work involved in subcontracting the loads.