Update 2022-03-16: According to the latest information published by the government, New Zealand will reopen its borders earlier than initially planned:
As early as 12 April, vaccinated international students will be able to enter the country and from 2 May, borders will reopen to vaccinated travellers from visa-waver countries, including Germany, Switzerland and Austria. As of July, individuals arriving on Accredited Employer Work Visas may then enter New Zealand. Quarantine is not required.
Currently, entry is restricted to vaccinated nationals, permanent residents, skilled workers and travellers on a working holiday scheme.
New Zealand will reopen to all vaccinated international visitors starting in October 2022.