At the point of high-fidelity prototypes, I would consider this more of an implementation stage. Most likely you want to implement a useable version in the software you are running, perhaps with as much of the existing interface. This version you would typically send out to your testers, or your selected users, for feedback.

Unfortunately this portion of the project is behind closed doors, but hopefully this narrative gave you a look at the UX Design process I have typically followed.