Check your data source's Filetime (legacy document)
In Data Sources, each source includes a Filetime.

The Filetime is a timestamp that refers to the last time a feed updated from its host.
Note that Flietime is only an indicator of the feed's status. The Productsup platform only sets the Filetime timestamp during import. If Filetime does not appear up to date, this does not necessarily mean the feed itself is not up to date. In this case, either the server has not updated, or an import has yet to occur.
Important: Flietime does not indicate the last import time. You can find the last import time in Import history.