Milka's Red Bulgarian is a slowpoke

[Cecilia_MD7a]

This is my first year growing MRB and I don't know what to expect. Of the 12 different varieties of tomatoes that I am growing this year, MRB and - oddly - Prudens Purple are the only ones that do not have any fruits forming yet. Both have flowers. I know that this is NOT normal for Prudens (in my experience), but is tardiness to be expected from MRB?