Yes, but production and throughput capacity, along with logistics of moving crops from the farm to a storage elevator are things that still need to be considered. Today's most advanced combines can harvest 10,000 bushels of corn per hour...you would need hundreds of robots in a field to even come close to that level of efficiency. One combine also needs about five semi-trailers driving around the clock to get all of the grain out of the field and into a storage elevator without slowing down the whole operation. Letting harvesting robots unload themselves into a truck one at a time would take weeks. There are some big changes that would need to take place to achieve what you are talking about.