6.7 engine air filter

[Tensalmon]

Since 2019 model year Cummins made changes including hydraulic lifters so there is no 100k mile valve lash adjustment.
Pop-off pressure checking is for mechanical injection system for example the original 5.9 Cummins. The 6.7 is a common rail electronic actuated injector. The only thing to check on those injectors are solenoud operation, spray pattern, & spray volume per set duration (flow volume).
It's common to run 2-300k miles on stock injectors as long as fuel system filters are maintained and you avoid fuel contamination. There are vendors that provide the service of checking your injectors and rebuilding them, or you could just swap them out. Of course like anything else can fail which is why it is important not to ignore or continue running if you observe issues or MIL is illuminating.