Currently there are 8 native Macro Prime lenses for Sony A7 III and 4 of these lenses are autofocus (AF) type.
A7 III also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on A7 III.
Since Sony A7 III has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 4 Macro Prime lenses with Weather Sealings.