On 31 July according to the official announcement. The Leftist media have adored him for leading Comrade Jacinda’s severe social control for 2 years, but Libertarians have a quite different view: he also stopped the effective and safe Ivermectin as a treatment for the China virus in favour of the expensive, useless and risky Pfizer substance — the deaths and injuries from which he downplayed and covered up — and he made no mention of the sensible ways to boost immunity and general good health by natural means. In fact all the terms for natural treatments were banned in the government’s long list of banned terms on its China virus response Facebook page — see this article on the BFD:

Of course, that doesn’t mean his replacement will be any better.