Last seen indication in Hangouts

Last seen indication in Hangouts :- To make it easier to know when people using Hangouts are available to chat, we’ve added timestamps as part of status (e.g. ‘last seen 2h ago’), indicating when one was last using Hangouts

Comprompt_Hangout_last_seen

Individuals can control whether this info is shared from Hangouts chat settings.

This feature is now available on Hangouts in Gmail (gradual rollout), as well as on the latest versions of the Hangouts Android and iOS apps.

As launched recently for Hangouts in Gmail, the latest version of the Google Hangouts iOS app now includes the ability to add custom status messages and see the status messages of others in the Contacts view. Status messages can be added via the settings menu.

Note: status messages shared on one device will also apply to other devices on which one is signed in with their Hangouts account.
This feature is coming soon for the Hangouts Android app.Release track:
Rapid release and Scheduled release

Release track:
Rapid release and Scheduled release

For more information:

Hangouts in Gmail (to be updated upon rollout completion)
Hangouts Android app
Hangouts iOS app
reference by: www.google.com