when can i apply apple card in UAE

You cannot apply for the Apple Card anywhere outside of the U.S. at this time. No one here in this user-to-user forum would know when or if that is likely to change.

This may help you find out. Is Apple card available in UAE?

Apple Pay works with major credit and debit cards from many UAE banks. Just add your participating cards to Wallet and you'll continue to get all the rewards and benefits of your cards.

Apple Pay - Apple (AE)