Agile measurements, such as the delivery of incremental working products, can improve upon predictive measurements by providing tangible progress and value at regular intervals. This approach is particularly beneficial when the final stages of a project are delayed, as it ensures that the customer continues to receive functional components of the product. This method aligns with the agile principle of delivering working software frequently, from a couple of weeks to a couple of months, with a preference to the shorter timescale1.
References:
37 Agile Metrics - The Complete Guide for Agile Teams1
Agile Practice Guide | Project Management Institute2
Agile project management and the PMBOK guide3

The best approach in this situation is for the project manager to facilitate a discussion between the team members and the construction manager to address the cultural differences and seek solutions. This aligns with conflict resolution strategies that emphasize communication, understanding, and collaboration to resolve conflicts in a multicultural team setting12. By discussing the concerns openly, the project manager can help foster mutual understanding and respect among team members, which is crucial for team coordination and performance1.
References:
Conflict Management, Team Coordination, and Performance within Multicultural Temporary Projects1.
5 Conflict Resolution Techniques in Project Management - PM Study Circle2.

The project manager should inform the steering committee that the project is currently behind schedule with a corresponding lower cost, and every effort is being made to expedite the delayed activities. This is because the actual progress is less than the planned progress, indicating that the project is behind schedule. However, the actual cost is also less than the budgeted cost, which means the project is under budget. The project manager should assure the steering committee that efforts are being made to expedite the delayed activities to bring the project back on schedule123.
References:
Steering Committee: Definition, Roles & Meeting Tips - ProjectManager
Steering Committees (Roles, How to Run Meetings) - Tactical Project Manager A Comprehensive Guide to Steering Committee Meetings.