When I was doing the research, I contacted Slee and discussed with them how they did it. They told me, it would not flow enough volume or pressure. I don't think very many have done it.
I just measured the pulley it is 5 1/4". When you order you need to tell them you want the V-belt pulley not the serpentine belt. I got the wrong pulley and had to do a pulley swap.
The short answer is no, the stock pump does not flow enough fluid or pressure. I used the following Trail gear setup: 2.7L 3.4L Tacoma Full Hydraulic Steering Kit - https://trail-gear.com/steering/full-hydraulic-kits/full-hydro-steering-kits/2-7l-3-4l-tacoma-full-hydraulic-steering-kit.html...