If we wanted to know how much work the person is doing on that pile, we would need to know how far the person is travelling in total and then the force of their shovel because work= force x distance.
Say he has to distribute whatever he is shoveling 2 meters away and he makes 5 trips. So 2x5= 10 meters. Say that each shoveling needs 2N. So 2x 5= 10n. So 10x10 equals 100 jouels of work.
Well to calculate power, we use work/time. So if he shovels for 20 minutes then 100/20 = 5 watts.
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