Hey James, the best way to find the latest updates would be to follow the @steemitblog -
This post is a few months old but provides the general timeline for SMT release - https://steemit.com/steem/@steemitblog/smts-release-dates
SMTs Release Date
We’re happy to announce and commit to a release of the TestNet in January 2019 along with a release and launch of the protocol on the MainNet in March 2019:
January 15, 2019 - SMT development complete and live on the TestNet.
March 24, 2019 - SMT fully released and live on the Steem Blockchain.