I do not think there are any plans that Nano will be implemented in Ledger desktop app for now. They give us possibility to store Nano coins in hardware wallet, but as a user interface we can only use NanoVault. I think it was simply technically not feasible for them to add Nano to desktop wallet since it is
completely different technology included here.
As far as i remember they told the first step was to implement the coins which were supported by their chrome applications (since chrome is shutting down all chrome applications + google is gathering massive amounts of user data).
Ledger told they are going to increase the number of supported coins gradually. In the end we will (hopefully) be able to access all coins storable on the nano s via ledger live.
But coins which were accessable via chrome applications needed to be implemented first -> then bug fixes -> UI/UX improvements -> adding erc20 -> adding more coins is the plan according to ledger.