I've wondered for a long time now: If battery tech can improve enough construction might look like renting an army of thousands or millions of small worker bots

I've wondered for a long time now: If battery tech can improve enough construction might look like renting an army of thousands or millions of small worker bots, with a couple guys at the command truck, or whatever, coordinating the movement of dirt or the depositing of materials, each bot moving a gram or two at a time.