Currently there are 15 native Standard Prime lenses for Olympus E-M1 III and 10 of these lenses are autofocus (AF) type.
E-M1 III also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on E-M1 III.
Since Olympus E-M1 III has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 3 Standard Prime lenses with Weather Sealings.