The thing is, I would be most surprised if everything was not all ready to go, & hence get them out of any really incriminating or damaging situation. I wonder if they wait until the last minute as there might a few areas where some fiddle-factor can be worked in to their advantage.
By waiting until just before any deadline for action on anything - I suspect they also create the perception that they are a bit of a nuisance but always can be relied upon to come up trumps, & everything is always present & correct or a blind-eye is turned to protect the authorities from any embarrassment.