For further information please go to the links below, Queensland Department of Health seem to have the best layout of easy to find information.

Queensland
https://www.qld.gov.au/health/conditions/health-alerts/coronavirus-covid-19
Australian Capital Territory 
https://health.act.gov.au/public-health-alert/updated-information-about-covid-19
New South Wales 
https://www.health.nsw.gov.au/Infectious/diseases/Pages/coronavirus.aspx
Tasmania https://www.dhhs.tas.gov.au/publichealth/communicable_diseases_prevention_unit/infectious_diseases/coronavirus
South Australia 
https://www.sahealth.sa.gov.au/wps/wcm/connect/public+content/sa+health+internet/health+topics/health+topics+a+-+z/covid+2019/community/information+for+the+community+-+covid-19
Northern Territory
https://health.nt.gov.au/health-alerts/novel-coronavirus-covid-19
Western Australia
​https://ww2.health.wa.gov.au/Articles/A_E/Coronavirus