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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If you are a healthcare worker or a childcare worker who has a pending Form I-765, Application for Employment Authorization renewal application and your Employment Authorization Document (EAD) expires in 30 days or less or has already expired, you can request expedited processing of your EAD renewal application. USCIS had previously announced this flexibility for qualifying healthcare workers assisting public health efforts in response to the COVID-19 pandemic. USCIS is now extending this flexibility to qualifying childcare workers.