After your upgrade, new features will become available immediately. For example, if you upgrade from Teramind Starter to Teramind UAM or Teramind DLP, you'll instantly be able to access reports like Keystrokes and Printing.
To see what's included in each plan, check out this article or the Teramind Pricing page.
Please remember that you will only see data recorded after the moment of the upgrade. None of your past or historical data will appear in the newly unlocked reports.