Good news: When your work permit expires, it is now automatically extended for 180 days past the date of expiration on your work permit card.
You still have to apply for renewal, but this extension will help make sure that you are not left without work authorization while you wait for your new work permit card.
If your employer/boss has any questions about this, or asks you for proof of this extension, here is what you should do:
1. Provide them with a copy of the receipt that shows that you have requested a renewal of your work permit.
2. Show them the letter (see below) that your work permit is valid for six months while you are awaiting for your renewed work permit card.
This letter can also be found on the UCSIC website at https://www.uscis.gov/working-united-states/automatic-employment-authorization-document-ead-extension