You are able to track your current case at any time at www.USCIS.gov
and clicking the "Check Your Case Status" link on the main page.
You can track your case using the receipt number on your I-797 Notice of Action (receipt for your filed application). Your receipt number starts with should three letters like LIN or SRC. If you have multiple applications pending, be sure to use your most recent receipt number to track your case.
If you do not have a receipt because you are filing under a different process, it is imperative that you keep track of your filing dates and approximate processing times. Processing times vary according to USCIS or DHS administrative delays and requests for more evidence.