Currently there are 23 native Standard Zoom lenses for Pentax K-3 III and all of these lenses are autofocus (AF) type.
K-3 III also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on K-3 III.
Since Pentax K-3 III has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 8 Standard Zoom lenses with Weather Sealings.