It looks as though Google Messages is getting real-time location sharing very soon, and there's a tweak to group chats too.

Once real-time location sharing is active in Google Messages, a persistent banner appears at the top of the chat, clearly indicating that live location sharing is on and showing how much time is left.

Stay in touch in a new way ...

At the moment, opening the ‘plus’ menu in a conversation for “Location” just sends your current position as a static Google Maps link. Google Messages will soon offer real-time location sharing ...