You can pour your CP batter at a few different stages. It mostly depends on what sort of design you're trying to accomplish. If you're only using one or two colours and want a heavily textured top, you can pour at thick trace. If you want a bit less texture and more fluidity, you can pour at light trace. If you want to do a super fluid or complex technique like certain swirls, you can pour at emulsion.
As long as everything is well-mixed, when you pour doesn't matter TOO much. I usually only stick-blend till emulsion (which is only a couple minutes) then add my colours and pour.
Someone posted a great little video showing what it looks like when you reach emulsion... hopefully someone can dig it up and post it here!
You can tell that you're at light trace when you lift your stickblender out of the batter and let it drip, and the drips leave a mark on the surface of the batter.