The builder did not say anything about brushing until start up, but I am reading that I should be brushing from fill up. The issue is the EQ is not running and there are not chemicals as start up is tomorrow?
It never hurts to brush the pool. The objective of brushing during startup is to keep the plaster dust in solution and not depositing and harding on the surfaces.
Welcome to TFP! For a wealth of pool care information please check out our free Pool School. If you are in need of specific help then we encourage you to Register and ask us here in the forum!