Prime Minister Jacinda Ardern will announce any change to the election date at 10am on Monday.
A spokesman said Ardern wants to review the latest advice from the Ministry of Justice, have the most up-to-date case numbers to assess the impact of the outbreak, and to take soundings tomorrow.
National leader Judith Collins has called on Ardern to delay the September 19 election until November at the earliest.
Collins went as far as saying it would be National's preference that the election should be held next year instead.
On Wednesday, Ardern pushed back the dissolution of Parliament until Monday – giving her more time to decide if the election should be delayed.