Currently there are 8 native Telephoto Zoom lenses for Fujifilm X-T4 and 7 of these lenses are autofocus (AF) type.
X-T4 also has a sensor based image stabilization system which means that all of these lenses will be stabilized when used on X-T4.
Since Fujifilm X-T4 has environmental sealings (Weather Sealing), you may like to couple your camera with one of these 5 Telephoto Zoom lenses with Weather Sealings.