you can tell whats ran by going to the Home button then > Discovery and Inventory > Inventory.
On the main page will be a table of bar graphs for each inventory type and how many have reported back in the last X Days. its not very precise but you can drill in to it to find out the details.
There are also under 'reports > Discovery and Inventory > Inventory > Cross-Platform > Inventory Agent > Inventory Diagnostics' a bunch of reports to work out which machines are new had changes and havent ran inventory in a specified period.
You can also see the tasks showing in the task history list in the agents themselves.
If they are enabled and the additionals in advanced selected then its just a matter of when the schedule kicking in and the devices reporting back in with inventory data.
I would personally add to the schedule for today on a few specified machines to ensure that the policies are kicking in atleast for a few test machines.