Andy’s right about the difference between Level 3 and 4, however I think your question may relate to the PM’s statement that businesses should prepare for Level 3 prior to Tuesday’s official Level 3 enactment. Between now and next Tuesday Level 4 will still be in place but businesses and schools should prepare for how they will operate from next Tuesday. Details of Level 3 here https://covid19.govt.nz/alert-system/alert-level-3/