The Monero community has been looking forward to hardware wallet integration for some time now. A community member is currently working on a self-developed project. Furthermore, Ledger has confirmed they will add XMR support. Up until now, there was no real deadline for finalizing this integration. The developer working on it is advancing significantly. In fact, the integration may be completed sooner than people assume.
One of the few things holding Monero back in the lack of hardware wallet support. Right now, no solution exists in this regard. Integrating this complex code has proven to be rather difficult, even for the Ledger team. That being said, the developer working on this project is making some great progress. Many people expect the project to be finalized by late Q1 of 2018. Whether or not that deadline is even remotely feasible, remains to be determined, for the time being. It certainly looks as if things are moving ahead very swiftly.