Add Woocommerce Fast and standard delivery optin [closed]

I want to add 2 shipping or delivery options to my woocommerce store. Example, 1) Standard delivery( 21 days) and charges 25$ . 2) Fast delivery(15 days) and charges 50$ . When a customer chooses one of these cart prices should be updated. I don’t have any idea. Can anyone guide me about that? Thanks