On a 1997 Ford F-150 with a 4.6L engine, the power steering pump is typically located on the front of the engine, driven directly by the crankshaft via a belt. It's usually positioned
on the passenger side (right side) of the engine, near the alternator and possibly the air conditioning compressor. It's a relatively large, cylindrical component with various hoses and lines attached.
However, it's best to consult a repair manual specific to your 1997 Ford F-150 4.6L to get the precise location and avoid any confusion with other components. A visual inspection with the engine bay open (after turning off the engine and allowing it to cool completely) will also confirm its position.