There are two types of status: production status and delivery status.
The production status is whether it has been printed and/or mailed yet. The delivery status is its location (after it has been mailed) along the path to Delivery or to failed delivery (e.g. Return to Sender).
You can check them by going to the Sent tab on www.docsmit.com, then searching for the particular mail piece. The color of the recipient's name indicates Delivery Status for tracked mail (certified and priority mail). Green indicates delivered and red indicates a delivery failure); for non-tracked mail (e.g. first class) black indicates sent mail. Grey indicates not delivered yet (including not mailed yet).