Apple
Therefore, we are deprecating support for TLS 1.0 and 1.1. Complete support will be removed from Safari in updates to Apple iOS and macOS beginning in March 2020.
https://webkit.org/blog/8462/deprecation-of-legacy-tls-1-0-and-1-1-versions/
Google
TLS 1.0 and 1.1 will be disabled altogether in Chrome 81. This will affect users on early release channels starting January 2020.
https://security.googleblog.com/2018/10/modernizing-transport-security.html
Microsoft
Today, we’re announcing our intent to disable Transport Layer Security (TLS) 1.0 and 1.1 by default in supported versions of Microsoft Edge and Internet Explorer 11 in the first half of 2020
https://blogs.windows.com/msedgedev/2018/10/15/modernizing-tls-edge-ie11/
Mozilla
In March of 2020, Firefox will disable support for TLS 1.0 and TLS 1.1.
https://blog.mozilla.org/security/2018/10/15/removing-old-versions-of-tls/