A new Grattan modelling report may be of interest, available here.
The report authors suggest that Australia can end lockdowns and start to reopen its border once 80 per cent of the population is vaccinated – and we may be able to get there by the end of the year. But if a vaccine is not approved for children under 12, a target date of March next year would be more realistic.
Page 4 and 5 of the report set out three implementation recommendations.