You could also use SQL to create a report that will show you the last time your computers collected metering information. Here is the query. I can add additional columns if you would like:
SELECT i.Name, r.[Collection Time]
FROM vRM_Computer_Item i
LEFT JOIN dbo.Inv_Inventory_Results r
ON r.[_ResourceGuid] = i.Guid
AND r.Agent = 'Application Metering Agent'
ORDER BY i.Name