Correct. So you could have three schedules configured applied to tags tag-a, tag-b and tag-c. Those schedules will be available in every network bound to a template, but because they apply to a tag, nothing further will happen at this stage.
Then in the first network, you can apply tag-a to all its APs. In the second network, apply tab-b to all the APs, and in the third apply tag-c.
Even though it is a template, all three bound networks will have APs that operate at different times.
I've done this many times for retail store chains. They'll want the majority of stores to use one set of hours, and then there will be a small number of stores with extended hours or that run 24x7 or are pop up stores.