@inthehands Kelloggs also has a Harvest Wheat cracker. Both it and Pepperidge Farm's have wheat germ in them. I think in all three cases though the word harvest doesn't have any literal meaning, but it's meant to be evocative of rusticness. Rusticity.
They're implicitly asking us to please imagine that the snack product in question is made near on or near the farm, from freshly harvested ingredients, and is definitely not the output of a factory with a bunch of complicated supply chains.