Ok this is good news then. The zipper is encouraging. In terms of last nights pipper, you should see its mouth moving like it is gasping, which is good. This means he is still absorbing the yolk. If you get to a point where you feel like you need to assist, make sure to watch for about 5 to 10 minutes before and make sure he isn't moving his mouth anymore.
But it looks like you did really good on the first assist.
I'll try and keep a better eye on my phone here for the rest of the day. I have a bantam hatch in progress at the moment, so we are kindred spirits!