Tour 165- more expensive one is my pick.
though they can change order/ timing, I would want to go directly to see the Last Supper first, then have time in Milan on my own.
you can’t miss the Duomo, as for going inside, you usually can.see dress requirements for entering churches.
The Last Supper is in a small church, on a narrow street, you will be assigned a time inside. I remember we had 15 minutes inside, 10 minutes in gift shop, then out.
that is a long trip there & back in a bus, hassle of waiting for stragglers, so having Last Supper first, in your own second is my preference.
these 3 tours are offered in my WC segment in 2024.