Even before the Strait of Hormuz closed, the US was already replacing diesel semis with electric. Diesel prices going up haven't exactly slowed this down.
As for smaller delivery vans, don't forget Amazon started deploying electric delivery vehicles in 2022:
Their EV fleet increased 50% last year:
https://insideevs.com/news/787405/amazon-rivian-electric-van-fleet-2025-update/