technically yes there are electrical ps pumps...
are they ones that will fit or easily be swapped into your truck? none that i've seen....
the only electric ps pumps i've ever seen were on hybrid electric vehicles, they need to be electric if the vehicle is programmed to shut down the engine when idle for more than 15 seconds to save gas....and then use fully electric launch when you hit the pedal...
but i actually tried to find one for a 2000 suburban hybrid project....came up with the conclusion that the easiest way to do it was to find the specs on the stock pump, and just buy an industrial pump that was similiar...
but unless you have more than one or two batteries in your truck it wouldnt be feasible...
it would definately give you a little more power to the wheels, but there are many better ways to get the same results