They said (1) that there's no fixed date for the launch, as this is an ongoing effort.
But considering that the initial version of the Site Editor is already part of the official Gutenberg plugin (2) – and they usually include features from the current version of the plugin in the main app – it is expected to be released with version 5.7 of WordPress, next March.
But considering that the initial version of the Site Editor is already part of the official Gutenberg plugin (2) – and they usually include features from the current version of the plugin in the main app – it is expected to be released with version 5.7 of WordPress, next March.
(1) – https://make.wordpress.org/core/5-7/
(2) – https://wordpress.org/plugins/gutenberg/