For standing orders that have been setup in Monzo you can check the end date by tapping the standing order and then tapping ‘edit payment’. Is this available when the standing order is created by CASS?
It doesn’t provide exactly what you are asking but at least allows you to check an appropriate end date has been set up.
Monzo doesn’t provide the ability to set up standing orders for X number of payments. You have to specify an end date instead (or specify no end date), which is perhaps why there is no element indicating how many payments are remaining.
But I agree, it would be a useful piece of information to have.