Once you've attended your visa interview and heard the gratifying words that your visa has been approved, you can track the status of your case to get a better handle on when you will have it in hand so you can travel.
You'll need to go to the following website and plug in your case data:
Location of application
CEAC ID:
PPT:
First 5 letters of last name
CEAC ID:
PPT:
First 5 letters of last name
It will first say "Approved" (this means it has been approved in the system, but the visa is not yet printed). Once the status is updated to "Issued" that means the visa has been printed in your passport and should be on its way via the delivery method you chose when you made the appointment.