You have about 13 months. If you start ASAP, labor certification takes about 8 months (on average, and assuming it doesn't get audited). Once labor certification is approved, you can file I-140 and pay for expedited processing which takes about 15 days to get approval. Then you may file for I-485 (along with the application for EAD and travel document which should normally be approved within three months). With that being said, consult the lawyer for your employer to see what they suggest.