Please contact your attorney for specific status and legal strategy questions. General information below:
The I-140, by itself, will not give you status or work authorization in the U.S. For example, if you are in the U.S. in F-1 status and filed an I-140 petition by itself, you will need to continue maintaining your F-1 status.
If your I-140 and I-485 were filed concurrently, you can generally remain in the U.S. while your I-485 is pending.