The Amazon fleet is about 70,000 vehicles and they’re transitioning to electric right now.
They are not doing this because of the goodness of their heart. They are doing it because of $$$$. Gas costs more, so it’s more economical to switch to electric.
Rest assured, if there are other places where it’s more economical to strip mine the environment and increase the rate of climate change, they will switch to that cheaper method in a heartbeat, if they aren’t already doing so.