All bodies of cabinet, including Treasury Board, continue as long as a government continues. Obviously, governments are bound to govern themselves somewhat differently, so it is certainly the case that Treasury Board looked to exercise urgently required business, in terms of approving spending, particularly in a context that there's no vehicle--in respect of last fiscal year, certainly--to proceed with spending if it was new spending, other than through warrants. So the test of urgently required for the public good would obviously be a guide to Treasury Board, not only to the individual minister.
However, until a new government is sworn in, for purposes of emergencies or any other needs, the sitting government has full legal powers.