It si recommended to apply for an EAD extension 120 days before expiration so if you are changing to J-2 that would be a good reason to do this at the same time. You must show that your spouse is not dependent on your income though for the J-2. work card.
Lynne R. Feldman, Attorney at Law
Concentrating in Immigration Law
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Former Adjunct Professor -- Immigration law
University of Illinois College of Law
It is always a good idea to apply for the EAD card's extension at least 4 months before its expiration date.
One of the conditions of applying for EAD as a J-2 is to be able to demonstrate that your spouse is not dependent on the income you'll make.
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I agree. The proper way would be not to seek an answer to your title question Instead, file for EAD extension along with the COS request. This way you will get both and will not need to guess.
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