Zero, because even with the current deadline as it is does not give enough time for procurement, installation, and testing. The current deadline is a "progress" deadline, meaning that some predefined amount of progress needs to be made by the deadline, not full installation.
When the requirement went into place, there were no off-the-shelf scalable PTC systems available to simply purchase, install, and use. Even as PTC is being installed now, it's a "lets put it in and see what happens" type of installation. But I do have to mention that without the requirement to install PTC, and without deadlines, it will never get done.