Given that Jordan routinely eats an early lunch around 11:00 am. Even if there's no clock in sight, Jordan can tell when it's almost 11:00 am because he feels hungry and wants to eat.
The explanation that accounts for this is Jordan has become classically conditioned so that the time of the day, 11 AM, is a conditioned stimulus (CS) for him, triggering internal bodily changes that increase his desire to eat.