The response I received about SMC and culturally arranged marriage visa from INZ :
Due to the high volume of residence visas we expect assessment to be complete 12/15 months from submission. If your visa application was processed in this time frame you could expect to receive a decision by July/October 2020, but we cannot guarantee a decision by this time. I do understand how frustrating this is.
Unfortunately the Cultural Arranged Marriage Visitor Visa is only available to partners of New Zealand citizens and residents. After your residency application has been completed and approved this would be an option for you, but until then the best option for your wife-to-be is the Partner of a Worker Visitor Visa or the Partner of a Worker Work Visa. Both of these options currently require you to live together in a genuine and stable relationship for 3-4 months before applying.