Hi,
To monitor work center performance in Odoo, you can follow these steps:

1. OEE (Overall Equipment Efficiency): This metric represents the percentage of time the work center has been fully productive. It's a composite metric that considers availability, performance, and quality.

2. Lost Time: This indicates the amount of time lost due to work stoppages, breakdowns, or other reasons.

3. Load: This metric shows the estimated time required to complete the current workload assigned to the work center.

4. Performance: Performance represents the real duration of work time as a percentage of the expected duration. It indicates how efficiently the work center is operating compared to the expected standard. For more information, you can check out the blog 

An Overview of Equipment Efficiency of Work Centers

Hope it helps