It's already 'live', but at the same time, it's still being improved upon; because it's not ready for mass usage just yet(in my opinion, at least). In fact, Bitfinex already accepts bitcoin deposits and withdrawals through Lightning. There are a good number of lightning wallets out there already, like Zap[1] and Breez[2], that you can try out right now.

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[1] https://zap.jackmallers.com/
[2] https://breez.technology/