I'd argue that you are in a 'strong' place if the mgmt is putting off releases - not the team. If you can be in 'can we release yet, can we release yet' frame,

I'd argue that you are in a 'strong' place if the mgmt is putting off releases - not the team. If you can be in 'can we release yet, can we release yet' frame, rather than 'when will this be ready to release?' frame, then you have a strong feature/value focused team. Again measuring the delays that are caused by mgmt, rather than you and you team, is really valuable. And as to time to sort out these metric - lean on jira etc to create these reports automatically - metrics and reporting should be as easy and as simple and as valuable as possible, or people simply won't track them - or care about reviewing them.