New Zealand has recorded 51 new community cases of COVID-19, including new unlinked cases in the Waikato.
The Delta outbreak first identified on August 17 rages on in Auckland, comprising 47 of the new infections reported on Sunday.
Of those cases, 23 are yet to be linked back to the outbreak by contact tracers.
On Monday, Jacinda Ardern's government will review lockdown settings for the three regions currently in lockdown: Auckland, Northland and much of the Waikato.
Those regions make up roughly half of New Zealand's population.
Auckland will stay in lockdown given the uncontrolled spread, which the health ministry predicts will double to more than 100 daily cases within the next fortnight.
Northland looks likely to exit lockdown, with no further cases identified in 10 days since two Auckland women illegally left lockdown into the region, before testing positive for the virus.
The Waikato will be a trickier call for Ms Ardern's cabinet.
On Sunday, there were four new cases identified - two in Hamilton, one in Raglan and one in Kihikihi - of which only one was already isolating as a household contact.
The lockdown announcement will be made at 4pm NZDT (2pm AEDT) on Monday.
The new cases come after a major vaccination drive this weekend.
"Super Saturday" proved a super success, with health workers giving out 130,002 doses of Pfizer; a daily record for vaccinations in NZ, and more than 2.5 per cent of New Zealand's population.
That rate was a bigger single-day effort than has been managed in Australia, Canada, the UK or US.
"People across the motu (nation) embraced Super Saturday like their communities' lives depended on it," Director General of Health Ashley Bloomfield said.
"It was inspiring to witness as we know the COVID-19 vaccine is key to our efforts to control the virus."
More than 39,000 Kiwis got their first dose of Pfizer, pushing the total number vaccinated to 3.57 million.
Just over 82 per cent of the eligible population is at least partially vaccinated, and 63 per cent are double-dosed.
The vaccination push included thousands in Auckland, which now sits at 89 per cent partially vaccinated.
"We're only 20,360 short (of 90 per cent vaccinated)," Dr Bloomfield said.
"Over the past week, Auckland averaged about 4000 first doses daily so we're on track to reach that milestone this week."
Australian Associated Press