Data point:
Just left LGA after connecting through Charlotte. We missed announcements at CLT because we were late to the gate and boarding was in process, but I did notice some passengers filling out forms.
When we arrived at LGA, the flight attendant told us to have our forms out to give to the CDC agent or have it open on our mobile device. At the end of the jet bridge, the agent was handing out forms and announced people could not leave the immediate area before turning them in.
I told the agent we lived in CT, and were not staying in NY. He asked, “how long are you going to be here?” I replied, “as long as it takes to get to our car, and drive home.” Then he let us go without filling in anything.
So, we will abide by the EO guidelines, but there doesn’t seem to be much enforcement coordination between the three states.