https://phys.org/news/2018-10-google-ios-real-time-friends.html

Already available on Android since 2017, the feature brings Google Maps in line with Waze (also owned by Google), and even Uber and Lyft, all of which have allowed iPhone users to give updates to let others track their routes. You can send the link through Apple's Messenger app, Facebook Messenger, WhatsApp or a number of other third-party messaging apps that you have installed on your iPhone.

Once sent, your friends will be able to follow you on your trip: seeing where you currently are and when you are expected to arrive at your final destination.