Currently there are 28 native Telephoto Prime lenses for Nikon Z6 and 24 of these lenses are autofocus (AF) type.
Z6 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on Z6.
Since Nikon Z6 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 17 Telephoto Prime lenses with Weather Sealings.