OM3 crowns. Will they be white enough?

I’m having 8 crowns fitted on my top teeth and the dentist recommended shade OM3. He didn’t have any examples with him to show me so I was just taking his word for it. Now I’m worried that the shade might be too dark. I doubt the lab have started making them yet as they only received the order yesterday. I would love any feedback or even better pictures on crowns or veneers in the OM3 shade.