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It's typically during rollout that you can measure the project performance unless there is a consistent checkpoint meeting where every stakeholder is informed on the current stand of the whole project whether it is failing, succeeding or at risk.
since you said report and its about project performance then it is the communication period where he communicates the process to who ever needs its feed back.
In monitoring and control such as
1. Analysis of the last performance.
2. Current Status of Risks and Issues.
3. Significant Achievements.
4. Work to be performed in the next reporting period includes full scale material, performance, etc.
Monitor and control process group
During Monitoring and Controoling Stage and Communication Process
Areas include: financial, procurement, risk, implementation progress, and progress toward outputs and outcomes, and against the identified milestones.
Guessing in monitoring and controlling process group