If I remember correctly, the first USPS fleet replacement option was laughable in its EV percentage, but I believe that has since changed to a significantly higher percentage.

https://about.usps.com/newsroom/national-releases/2022/1220-usps-intends-to-deploy-over-66000-electric-vehicles-by-2028.htm

This USPS announcement says 75% will be electric, and they’ll only be buying electric after 2026.