My question: Is there any way i can get copy of I-140 from USCIS along with copy of Labour certificate.
No. You are not the petitioner and have no rights to any information from USCIS regarding the petition. Are you sure you want to work for someone who would keep you in the dark like that? Sounds like it may be an unpleasant work environment (almlost like slave labor).
How to find I-140 details if employer not sharing