My experience has been that minoxidil on the temples is more about maintenance than regrowth. I wouldn't expect to see any significant regrowth on the temples unless you are in that lucky 1-2% that seem to respond in that area.
My temples continued to receed while on finasteride so I decided to add foam once per day just on the temples. I had a nasty shed about 3 weeks in which thinned out the hair, but it all came back, and I don't think I've lost anymore ground on the temples since I've been on finasteride (just over a year now).