his i-130 was approved . and we want to adjust his status before the immigration judge
When I-485 is filed with the immigration court, he can seek EAD as an incident to I-485.
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Yes, the moment you file the I-485 you'll also file for the I-765 for employment authorization as part of the I-485 AOS, free of extra charge.
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Your husband can apply for a work authorization only together with the adjustment of status application (I-485).