Not a score or a maturity rating. The actual behavior of the process, in units your plant managers and finance team already argue about.
Site variation
The same order type, plant by plant, so improvement effort goes where the spread actually is rather than to the average.
Rework and repeat handling
Orders that went round twice — re-scheduled, re-inspected, corrected or credited — separated from orders that went round once.
Waiting versus working
How much of the cycle was someone doing something, and how much was the order sitting in a queue between two systems.
Handoff friction
Where the order crossed a boundary — planning to production, production to warehouse, warehouse to billing — and lost time doing it.
Variant sprawl
How many distinct paths one designed process actually runs, and which of them carry the delay and the cost.
Commitment risk
Which orders are drifting towards an SLA or delivery breach while there is still time to intervene.