I have been testing this too, using a private Moto route from Elvas in Portugal to Badajoz in Spain on 2 November.
The visible time-zone label is helpful. In my summer-date test, a 09:00 WEST departure gave a 09:19 arrival, with the Spanish waypoint also showing 09:19 rather than 10:19 local time.
For European touring, seeing each stop’s local arrival time would make planning hotel arrivals and other timed commitments clearer. Could waypoint-local times be considered, with the relevant zone shown?