When can I actually work?

So I'm applying for a marriage based GC. I applied for the EAD also. My biometrics have now been added to my case so I assume the next step for the EAD is "card being produced"

My wife's dad has a job waiting for me as soon as I get work permission. Can I technically start work now or do I have to wait for the card to physically arrive. My father in law wouldn't need to see the card, just that I have permission to get paid.