According to the PMBOK Guide, 6th edition, section 4.7.3.2, the project closure report should include information on benefits realization, such as who will be responsible for tracking and reporting the benefits, what metrics and indicators will be used to measure the benefits, and when the benefits are expected to be realized. This is consistent with the PMI-PBA Practice Guide, section 2.5.2, which states that the business analyst should document the benefits realization plan and communicate it to the relevant stakeholders. Therefore, the project manager should document this information in the project closure report and ensure that the project sponsor and other stakeholders are aware of it. References:

PMBOK Guide, 6th edition, section 4.7.3.2

PMI-PBA Practice Guide, section 2.5.2