I've had the screen enabled on my 2016 F450 that allows you to monitor the DPF soot load, and was observing just today what happens when the exhaust filter gets "full". I've also got a Scangauge on it looking at several temperature points, one of them being EGT4. I'm assuming EGT4 is the last one, right after the exhaust filter. It usually runs at 600-700 degrees. When the exhaust filter got to "full", it started to regen and EGT4 went to over 1350 degrees. What surprised me is that it only cleaned it down to 80%, then stopped. This was all at highway speed, I didn't do anything that would have stopped the regen process. I guess the software knows what it's doing.
The DPF % Full screen is one of the screens that will appear under the Gauges menu if your technician will enable it. He may not want to enable it though because it also enables the ability to do manual regen's. You should never use that on your own.
:):)