The MODs are personal projects of people unaffiliated with the phpBB Teams (phpBB Group). As such we cannot give you a time frame for their release as that is up to each individual developer.
You use MODs at your own risk as always, with the added risk of in development MODs as being marked by the creator as still being in development, and not having undergone inspection by the phpBB Modifications Team for compatibility, security, and other issues.
Still no guarantees are made.
If you are happy with the potential consequences and know what you are doing, there is nothing I can do to stop you using the MODs other than giving my advice which echos the messages splayed around the forums, documentation, and even this post.