Isolation for close contacts ends in NSW at 6pm on Friday and in Victoria at 11.59pm.
In the ACT, household contact quarantine rules will be scrapped after Anzac Day.
Victoria will also ease rules on vaccination status and check-in requirements for pubs, restaurants, theatres and sports venues.
Vaccine mandates for workers in multiple industries are being retained in Victoria, while NSW will shift to a risk assessment based mandate model.
NSW Premier Dominic Perrottet said on Thursday he has asked his ministry to conduct the risk assessments immediately.
The change to isolation requirements mean people who are household contacts of a positive case will no longer need to isolate at home for seven days, so long as they continue to test negative.
They should still work from home where possible and avoid high-risk settings such as hospitals and aged care homes.
The Australian Health Protection Principal Committee had indicated it would be appropriate to drop some of the stricter restrictions once the current wave of infections had peaked.
Omicron cases are plateauing in NSW with a steady decline in overall infections in young people, the latest surveillance report from state health authorities says.
The report for the week ending April 16 also showed unvaccinated NSW residents were still over-represented in hospital admissions.
Rural and regional NSW health districts were relying mostly on rapid antigen tests for diagnosing infections, with more about 80 per cent of infections caught by rapid tests in the far west, north coast and Murrumbidgee health districts.
Sydneysiders had better access to PCRs with a little more than 50 per cent using the tests to detect the virus.
Opposition Leader Anthony Albanese will continue his federal election campaign from isolation after testing positive to the virus on Thursday.
LATEST 24-HOUR COVID-19 DATA FROM ACROSS AUSTRALIA:
NSW: 15,283 cases, 13 deaths, 1632 in hospital, 63 in ICU
Vic: 18,968 cases, 16 deaths, 428 in hospital, 30 in ICU
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