From the computer that you would like to know if it is encrypted, you can follow these steps.
1. Click on the red McAfee shield icon on the bottom right of the computer screen.
2. Go to Quick Settings.
3. Select Show Drive Encryption Status.
4. A box will pop up showing the System State as active or inactive. It will also say if the machine is encrypted, decrypted, or some percentage is encrypted.
Or from ePO you can create a new Drive Encryption query from the Queries and Reports tab.
Choose the result type Drive Encryption - Volume status. Then hit next.
Then you may choose how you would like the data to be displayed. Then hit save.
Find the query in Queries and Reports. Hit run.
This query shows your machines and the volume that they have encrypted.
I hope this helped.