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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Until further notice, employers should continue using Form I-9, Employment Eligibility Verification. This current version of the form continues to be effective even after the Office of Management and Budget control number expiration date of March 31, 2016, has passed. USCIS will provide updated information about the new version of Form I-9 as it becomes available.