https://www.covid19data.com.au/cases-last-28-days updated and backdated its data today.
The volatile daily effR is 1.26, but the more stable and meaningful mean effR of community spread (R8) is 1.59 and possibly showing a slight early down-trend.
The maximum proportion of cases that can be detected in the community and still end the current wave (ie bring community effR to 1 or less) is 40%. Currently it is nearly 90%. Delta strain is difficult to trace before it spreads, so ensuring early isolation of contacts is difficult.