If I may verify the processing times involved in NIW. Since it falls under EB2 category, I am assuming it may be a long time before I can get my EAD card and be able to change employers. Also, I want to confirm if there could be issues if I change employers during the process - If so, I'd prefer to change my current employer before starting with it.
You can change employers any time if you are a self-applicant and will continue to work in your stated area of national interest. But NIW priority date will take the same time as a normal EB-2 application does. See:
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I have Bachelor of science in nursing with 10 years of progressive experience (8 yrs in my home country then more than 2 yrs here in USA), do I qualify for EB2? What are the chances to get approved? If the company will file for concurrent filing of I-140 and I-485; will they give me working permit or EAD within 60 days though I-140 under EB2 category is still pending?
If your job requires BS + 5 years experience and you meet the requirements, EB2 is a possibility. Assuming you are born in a country for which the EB2 priority dates are current, you should get an EAD while the 140 and AOS are still pending.