IMO, since EB2 ROW is current you should be receiving adjustment of status confirmation anytime now. That's the sunny side scenario. Alternative path - start looking for similar job asap (with same skill-set, similar role etc) in an unlikely case there's an RFE that seeks your current employment verification (unlikely because I-140 is already approved and generally during adjudication of I-485 RFE of that type are rare. It's mostly personal - like BC, copies of passport, copies of I-20s, H1bs etc).
I am more than positive about your chances of getting GC pretty soon. All the best.
Source:
http://www.trackitt.com/usa-discussion-forums/i485-eb/215510491/layoff-on-pending-i-485

http://forum.murthy.com/index.php?/topic/49272-lay-off-while-on-ead-and-i-485-pending-pd-not-current/