This is a Daily Activity; the way a Project Manager continuously contributes to the project, and teams.
Deliverables assigned to Team Leaders and Supplier PMs can be completed any day, and that’s time for a quick review and approval by the Project Manager. The approval in this activity is preliminary. The Project Manager shouldn’t be afraid of approval, as it slows down the project.
Large amounts of work-in-progress is a common problem in projects. It reduces the predictability of the project, takes more resources, and usually lowers quality. It’s best to limit it, and have a clear activity for receiving and approving the deliverables.