e.g. Stage 1: London - Tour De Zwift - Cycling | Zwift
No date/time options yet even after registering at The at Home Cycling & Running Virtual Training App
On the FAQ post (Tour de Zwift 2020 Cycling FAQ) Shuji said they should be in the Companion app from “next week” (that was 6 days ago), so I expect times will be available at that point.