Currently we don't have any timescales or information that we can share on an official SteamVR Leap Driver, there is a community build SteamVR Leap Driver which is available here that I recommend having a look at. We are focusing on embedding our technology directly in the products that you love in order to give the best hand tracking possible rather than looking to emulate other devices and give a substandard performance.
Recently we have announced collaborations with Varjo, Pimax and VRgineers which include our hand tracking technology into their latest headsets as well as integration to OpenXR and Qualcomm with lots more exciting things yet to come.