As part of your marriage green card application you may apply for a work permit with USCIS Form I-765 (“Application for Employment Authorization”).
You normally file this form along with your marriage green card application (Form I-485) or at any time after you’ve gotten a notice that USCIS has received your green card application.
If you apply for a work permit in the same package with your green card application, you simply need to include a completed Form I-765 and two passport-sized photos.
Fee:
There is no fee for filing a work permit application if it is included in the same package as your green card application.
Processing Time:
It currently takes about 150–210 days (5–7 months) for USCIS to process work permit applications.