The Morrison government has secured one million Pfizer vaccine doses from Poland, half of which will be shipped to troubled NSW.
Now entirely locked down, the state announced an additional 415 virus cases on Sunday and four more deaths - three women in their 50s, 70s and 80s, and a man also in his 80s.
The death toll now stands at 48 from this outbreak.
Prime Minister Scott Morrison said the additional Pfizer batch from Poland would start arriving from Sunday night and around half would be targeted at 20 to 39 year olds in 12 NSW local government areas where the COVID-19 outbreak continues to grow.
The doses originate from the Pfizer plant in Belgium, where Australia has obtained its other doses.
"A key factor in being able to secure these doses from our Polish friends has been we have had a significant outbreak in our largest city," Mr Morrison told reporters in Canberra on Sunday.
West Australian Premier Mark McGowan wants NSW to adopt the approach to "crush and kill" the virus that was taken by his state and in South Australia, and continues to be in Victoria and Queensland.
"We just want them to get it under control for the sake of the people in NSW and also for the sake of the rest of the country," Mr McGowan told Sky News' Sunday Agenda program.
"NSW delayed putting in measures that worked, they obviously believed all that stuff written about them being the 'gold standard' and all that sort of stuff, which was clearly a mistake."
ACT Chief Minister Andrew Barr was pleased by the statewide NSW lockdown, saying its provides an extra layer of protection to the territory, which is also in a week-long lockdown.
"We are aware of the challenges the cross-border situation presents and we're working with our NSW counterparts to make it as straightforward as possible," he told reporters.
The ACT recorded two new infections, bringing total cases to nine.
Victoria recorded another 25 infections, while Queensland enjoyed a zero day.
Meanwhile, the federal government will start rolling out a fast COVID-19 screening program for NSW aged care residents and visitors that will be done on site and more regularly.
The COVID-19 rapid antigen testing (RAT) program will begin on Monday at the Uniting Bankstown Aged Care Facility, and then progressively roll out to other facilities who have expressed interest in participating.
"Given the rate at which we know the Delta variant can be spread between people, the very fast turnaround of RAT - around 15 minutes - makes these tests useful in preventing asymptomatic transmission and outbreaks as they can be used on a daily basis," Health Minister Greg Hunt said.
He said the pandemic's toll in Australia last year was highest among aged care residents.
"That is why, along with the increased infection control training and vaccinations, we are looking at further innovations such as RAT to provide an additional layer of protection for the most vulnerable Australians," he said.
