Did I add metabisulfite at the wrong time?

I'm doing my second Winexpert kit, and just completed Step 3 last night: racking to a carboy, adding metabisulfite, sulfate, and clarifier as per the directions, and degassing. I also added an additional 1/4 teaspoon of metabisulfite as per the directions in Step 4 since I intend to age the wine for at least six months.

Will I be OK adding the extra metabisulfite now? Will I need to add more after I rack off the clarified wine to another carboy, or is it fine for bulk aging as is?

Now or later...doesn't really matter. As long as every other racking (3 months or so) gets another dose.