Early last year, Christchurch District Court Judge Jane Farish ruled McGrath should stand trial across the Tasman.
However, her decision was appealed to the High Court, which then referred the case back to Judge Farish, ruling that she needed to again look at whether the case should be referred to the Minister of Justice for a final decision on McGrath's extradition.
And in January, Judge Farish referred the decision to Ms Collins, saying she was satisfied there were "compelling and extraordinary circumstances" for the decision to be made by the minister.
Over the past few months, McGrath's lawyer Pip Hall QC had been seeking permission for more time to make submissions, and the issue had been set for a High Court hearing in Christchurch tomorrow (WED), but the request for more time was granted and the hearing cancelled.
It's now left with Ms Collins to make a decision.
No timeframe has been given.
McGrath is living in Christchurch on bail.