The only thing I would say is that there is a specific authority that's in supply that's been granted per Parliament. That would be through main estimates, and then any supplementary estimates that could be before that, if there is one.
After that, once you're in the writ period, then you move to Governor General special warrants. It would need to be something as routine business and that is approved by the Governor General through the writ period. That period can last from the beginning of the writ and can span up to 60 days past the return of the writ.