Here you go:
I'm pretty sure both Google maps and AA maps are now fully up-to-date with the road closure.
There is also this useful map from DoC:
Basically as far as it affects you, you have no choice of route from Nelson to Kaikoura but must take the inland route (SH7) with a recommended stop at Hanmer Springs. The biggest problem is that this road is doing the work of two roads & is carrying 3 times the traffic it was designed for. Speed limits have been lowered and passing bays built to cope with this, but it is still a very slow journey.
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