Yes, it can be used. There are multiple implementations. I’ve been working on adding it to Sparrow wallet for the past few weeks.

GitHub

GitHub - QcMrHyde/sparrow-joinstr: Desktop Bitcoin Wallet focused on security and privacy. Free and open source.

Desktop Bitcoin Wallet focused on security and privacy. Free and open source. - QcMrHyde/sparrow-joinstr

Stating it can be used in production is pretty reckless imho.