Answer:
To monitor pending Workflow Actions, the System Administrator should view the Workflow Queue. This queue displays a list of all pending Workflow Actions that are waiting to be processed. The System Administrator can view the Workflow Queue by navigating to "Monitor > Workflow Queue" in the Salesforce interface.
It's important to note that Time-Based Workflow rules are evaluated and their associated actions are added to the Workflow Queue on a regular schedule, typically every hour. Therefore, it may take some time for the follow-up email to be added to the Workflow Queue after the Case is closed.
If the System Administrator wants to verify that the Time-Based Workflow rule is functioning correctly, they can also check the Time-Based Workflow history related list on the Case record to see if the follow-up email was added to the Workflow Queue as expected.
Step-by-step explanation: