could advance the good engine(s) to rated thrust at any point in the takeoff without adverse effect
You are permitted to advance the thrust to the "RATED" thrust without encountering any adverse effects, however this only applies when you are using Reduced Thrust with either the Assumed Temperature Method or Flex Thrust. The VMCG is always based at actual temperature to provide you with the required protection.
If your aircraft is operated with Fixed Derates such as TO/TO-1/TO-2, you will not be protected if you advance thrust from a TO-2 ATM to TO at actual temperature.
Barit1, that rule still applies.
Mutt