Hi Al5,
This information can be found in the Admin API in the “Update History” section. The endpoint is:
GET https://{funnelback-server}/admin-api/collection-info/v1/{collection}/update-history/
The response will contain the timestamps (in seconds) of the collection updates. It would be best to try out this API using the Admin Interface to understand the request and response format, and then integrate it with your processes.