I think the outcome depends on a lot of things.
The company can have a general outcome, increasing profits, save money on the budget, etc.
And we have a sector outcome, for example: Before BPM, Customer service had a response time of 3-4 days. After some analyzes and improvements, the time was it shorted for 1-2 days.
On the BPM implementation, it’s very important to define the metrics general and specific for the comparison.