They already have that. In Germany, mail is delivered by custom-made electric vehicles (streetScooter) and at least in London, UPS already uses electric trucks for delivery.
I'm working at an online supermarket called Picnic, in the Netherlands, and we deliver with small electric trucks. It works well in cities and suburban areas. People seem to like seeing the trucks in the neighborhoods compared to larger box trucks used by other delivery companies. It's small and quiet, which makes it less of a nuisance.
