After your petition is filed, USCIS will mail an official receipt to the employer so you can track the processing of your case. If your petition is incomplete, USCIS may have to reject it, or ask you for more evidence or information, which will delay processing. Working with an experienced immigration attorney from the beginning will help you avoid errors and delays.
Normally, when USCIS approves the petition, notice will be sent to the U.S. Embassy closest to the foreign nationals foreignn address, where they can schedule a visa interview. If the beneficiary is already in the United States in a different visa status, their status may be changed at the same time the petition is approved. Even if your status is changed in the United States, you will need to obtain a new visa if you ever depart the United States for travel.