Mosque massacre explainer : Shock and sadness over the New Zealand shootings
Tarrant had planned to fight the charges but changed his plea to guilty in March this year.
Justice Mander said arrangements will be made to allow victims and family members currently based overseas, and unable to travel to New Zealand, to view the sentencing remotely.
New Zealand borders remain shut for foreigners, and New Zealanders returning will have to stay in quarantine for 14 days, as the government looks to limit the spread of the coronavirus pandemic.
Tarrant's remand was extended to find a suitable date after all Covid-19 restrictions were lifted.
However, waiting for changes to border controls will likely result in a very extended period of delay, Justice Mander said.
"Finality and closure is considered by some as the best means of bringing relief to the Muslim community," he said.