Like Laurel said, it's a matter of preference. Some people separate before the smoke especially if they are going to make burnt ends from the point.
I think the next packer I do, I will separate before the smoke. I had every intention of doing burnt ends yesterday but when it was time to take the brisket off, I had a lot of things going on didn't want to stop and separate the point before coolering it. And after the rest, the point usually won't hold together enough to cube.
Give it a try and see how you like it.