When can I start giving my son whole milk?

He is 9 months old now.

But I was going to wait til he is 10 or 11 months old to start winging him off the formula and on the whole milk.

He already drinks juice and water in a sippy cup during the day and drinks 3-8oz bottles too.

He also eats food that my husband and I eat. (Doctor said that was fine)

Any advice??