From a Feb 2018 news item....
https://www.itnews.com.au/news/defence-airservices-finally-sign-12bn-contract-for-onesky-485875
"Defence last year pushed back its expected timeline, forecasting that initial operational capability could be achieved by November 2022, and final operational capability by October 2025.
When the CMATS project commenced in 2010, both agencies thought the system would reach final operational capability in 2017-18"