Speechdio Agency Upgrade adds the Agency features in your Speechdio Account. When you upgrade to Speechdio Agency, you'd be able to create up-to 5 sub accounts under your agency account and connect AWS S3 as cloud storage.
So if you had Standard and upgraded to Agency, to test if your Agency Upgrade is active or not, login to your Speechdio app, on your dashboard on the top you should see an option called Subaccounts. If you see the Subaccounts tab, your Agency is already active.