Its too early to say atm.
The NZ government are definitely under growing pressure as concern from the NZ public gets stronger and resentment of lockdowns will kick in.
As it stands cases are not expected to peak until Wed - Fri this week, after which they hope that the effect of the lockdown will kick in.
The real concern right now has to be that the number of cases detected is at the upper end of their modelling though. That either means that they've done really well on detecting a high percentage of cases or the case load is on the higher end and may be more widespread than they think.
I think there's two issues that are bothering the government. First is that Delta can be infectious within 24 hours of getting it, which means it is harder to track and trace and theyve been having problems getting details of where positive cases have been promptly as people have found it very distressing being diagnosed as covid positive and there have been lengthy queues of up to 9 hours just to get tested in some hot spots. This all slows the process down.
The good news is that they aren't seeing anything unexpected in the waste water suggesting that its spread beyond where they've found cases and they still are in a phase where theyve been able to connect all the cases together by contact. In other words they aren't seeing new clusters pop up which they don't know where they have come from.
From those two points of view things are still looking very good.
However its very much a case of the country holding its nerve. They haven't announced that the Auckland lockdown will be a few weeks yet, but that looks inevitable and thats when things will start to be tested.
There is only going to be so much good will from the public. Things like having to queue for hours to be tested and a prolonged lockdown will mean that the chances of cases being missed rise.
I think the South Island is likely to be ok. At least for the time being.
For the North Island I think things hang in the balance but you definitely can't yet say that the strategy has failed. It may be the case that it does prove to have failed but atm NZ aren't there yet.