"There is a seven to 10-day lag between the daily reports in numbers of cases and people dying", Prof Kidd said.
Australia recorded its biggest one-day rise in COVID-19 deaths on Monday although a slowdown in new cases gave hope that a second wave of new infections in the state of Victoria may have peaked.
But ultimately, the premier said the health advice he has received appears to indicate case numbers will continue to fall.
The latest figures did not include new infections and deaths from other Australian states, although Victoria has been accounting for the vast majority of both in recent weeks.
The slowdown in cases comes more than a month after the almost 5 million residents of Melbourne, the capital of Victoria, were told to stay home, and a week after most businesses in the country's second-largest city were ordered to close in an attempt to slow the spread of the virus.
With metropolitan Melbourne under stage four restrictions and the lockdown set to last another five weeks, Premier Daniel Andrews said cases are stabilising, but that the state has a long way to go.
It was considered a global leader early in the pandemic when it swiftly shut its worldwide borders, imposed social distancing rules and implemented mass virus testing.
Australia's coronavirus death toll has surged from 200 to more than 300 in just nine days.
Outside the two largest states of Victoria and New South Wales, the virus has effectively been eliminated.
There remained six total cases and one active case linked to people with addresses in the Mildura local government area. The state is experiencing some of the strictest social-distancing measures in the western world, crippling economic activity there and shaking confidence across the nation.
Authorities worry the spike in cases in Victoria has already spread to other states despite borders border closures.
But Morrison said the alternative was unthinkable.
Prime Minister Scott Morrison lashed out at suggestions elderly people could be sacrificed to the virus after a rump of columnists continued to float the idea. "An absolutely amoral, disgusting thought".