It is important to use the SCATT for training and not for score. It is absolutely fantastic to show both coach and shooter what is happening.
There is nowhere to hide.
One key thing to look for is the Length number. It is the length of the trace in the last second. The shorter the better the hold. Prone should be down around the 10 to 12 mm.
Another is how the shooter approaches the target. If the breathing is right - breath out and allow the rifle to reach the midpoint of the target with breath confortably emptied, then make sure the approach comes up the breathing line and meets the middle of the target. Not to one side and shuffled across.
It is good to find the best position of the sling to minimise pulse. High or low on the arm, tension into the shoulder.
Watching the shot going off and the follow through. Rifle remains on the target for a good second or so before moving to the next shot.
I can guarantee once those simple things are mastered, SCATT can be put away and used just to check progress of those few things above each month or so. Especially for a beginner.
For seasoned shooters, being able to watch good scores being produced in front of you gives you great confidence for shooting matches. The psychology of watching 10, 10, 10 all the way through the exercise and then controlling the emotions while it is happening has profound effects on competing.
Have fun.