Deere bought Blue River, which does this. Deere packages it as a wide implement attached to a tractor. Cameras look down, recognize weeds, and zap them with targeted weed killer. About four companies are already in this space.

It's sold as "weeding as a service". If you need large-scale weeding, Pacific Ag Rentals in Salinas, CA, will rent you a Robovator. That's made in Denmark, and Pacific Ag Rentals beefed it up for serious use. It kills weeds by chopping them out of the ground with computer-controlled knives. No chemicals, so, "organic".

Making these things rugged enough to do the job is a problem. The R&D projects tend to have flimsy mechanical engineering. You want to be able to pressure-wash the thing. Dust-tight and water-tight are solved problems, but most machine learning people have never dealt with that.