If you do decide to make the trip anyway, you can check here for any delays you could expect on the roads:
https://www.journeys.nzta.govt.nz
Don't be too discouraged by all of the chaff on the map, this will label any and all roadworks, so your trip could look completely devastated when there's only a few sections of stop/go roadworks or something. Even sidewalk repairs are displayed.
Alternatively, you can check here for only the road closures:
https://www.journeys.nzta.govt.nz/tr...=road-closures