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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We won an EB-1 Outstanding Researcher case for an applicant with a Ph.D. in Experimental Chemical Physics filing under Premium Processing. The case was decided within two days of submission. The applicant had over eleven years of research experience and an abundance of publications as a result of his extensive list of original findings. As a result of the multitude of publications in prestigious, international scientific journals, the applicant’s work was also extensively cited.