South Australia has recorded 5,784 new COVID-19 cases today, the state's highest daily total during the pandemic.
A woman in her 90s and a man in his 80s who tested positive to the virus have died.
There are 208 people in hospital, up two from yesterday, including 12 in intensive care and one person is on a ventilator.
The previous highest was 5,679 cases on January 14.
Chief Public Health Officer Professor Nicola Spurrier told ABC Radio Adelaide this morning that the the state had "probably" reached the peak of its Omicron wave, but it was too early to tell.
"I wouldn't want to call it until I've seen the rest of the week's data," she said.
New modelling shows the state can expect 5,500 daily cases under the peak, a significant decrease from the previously expected 8,000 cases a day under older modelling.
Today's numbers jumped from the 5,068 new infections recorded yesterday, but cases typically spike mid-week.
Professor Spurrier said the state was still on track to remove masks next Thursday.
Under the expected changes, masks will only be required in high-risk settings such as aged care, hospitals and potentially on public transport.
However, Professor Spurrier said mask-wearing was encouraged beyond the mandate.
"Just because we would change a mandate and a requirement in certain places to not wear a mask, doesn't mean you have to stop wearing it," she said.
With winter approaching, Professor Spurrier also urged people to book in for their flu vaccine and ensure they had received a COVID booster shot.
"Please get the flu vaccine this year because getting COVID and the flu is just not going to be a pretty picture for people," she said.
Professor Spurrier said authorities were working on "dual testing" for COVID and influenza, as well as working with GPs to allow people with respiratory symptoms to be seen by their doctors.
COVID forces classroom closures at six schools
Meanwhile, one of South Australia's largest public schools will transition to online learning from tomorrow as it grapples with COVID-19.
More than 1,500 students at Brighton Secondary School, in Adelaide's west, will learn from home from Thursday until next Tuesday.
In a statement on its Facebook page, the school thanked parents and caregivers for their "ongoing support during this challenging time".
The Education Department said six schools across the state currently have classroom closures due to COVID-19.
The vaccination mandate for South Australia's public schools ended a week ago, but private schools have yet to decide what they will do.
Independent schools have been undergoing consultation, while Catholic Education SA has asked staff for feedback on a plan to continue compulsory vaccination.
