"TLS 1.3 is already widely deployed: both Firefox and Chrome have fielded “draft” versions. Firefox 61 is already shipping draft-28, which is essentially the same as the final published version (just with a different version number). We expect to ship the final version in Firefox 63, scheduled for October 2018."
https://blog.mozilla.org/security/2018/08/13/tls-1-3-published-in-firefox-today/