It helps that you are precise about its age and two weeks is certainly fresh. If you spread it now, some nurients from the horse-poo will wash out and much of the bedding will be left in the way by spring (assuming there is bedding).
Stacking it in a tidy heap, preferably with enclosed sides to keep some warmth in, will see worms arrive soon and by next summer you can be spreading it around plants. Worth waiting.