Drone delivery is probably great for whatever evolved from the
BLU 108 anti vehicle submunition...
https://www.youtube.com/watch?v=IKBtkR8J2RE
The drone would have to be a couple hundred feet up, doing 18 mph. Would get slaughtered except possibly @ night. Pretty sure that BLU 108 comes a a full up round. Handling submunitions is a bad idea.
The drone is too big, too slow, and the payload sucks except for troops in the open and maybe unarmored vehicles. Effective casualty radius is 30 meters/bomb.