Hi Andy I have been going off this info to date,
We expect these businesses and services to:

• comply with all relevant COVID-19 legislation requirements
• have the appropriate infectious disease controls and management systems in place to reduce the likelihood of their workers being infected by COVID-19, and
• notify us if a worker contracts COVID-19 and work activities are a significant contributing factor to their infection.

https://www.worksafe.govt.nz/managing-health-and-safety/novel-coronavirus-covid/our-enforcement-approach-during-the-covid-19-pandemic/