At this time, only real time reporting is available for Agent availability in the Talk Dashboard. It would be store this data so that the agent Total Online Time and Time Available can be tracked. With the current functionality, it requires someone to log in at the end of day (not ideal when you have coast to coast support) to retrieve the day's metrics manually.

Unsure if this topic was posted, but wanted to follow up on this thread initiate 2 years ago - https://support.zendesk.com/hc/en-us/articles/115006250347-Can-I-report-on-agent-availability-in-Zendesk-Talk-