ISO 9001: 2015 does not provide, does not prescribe the existence of a QMS working committee, but it also does not prohibit it. Each organization must consider which organizational arrangement is best suited to its internal culture.
So, I advise you to start with the end in mind. What is needed to happen at a higher level to ensure continued compliance to certification?
Ensure that internal audits are done and closed
Ensure that management review takes place and is effective
Meet to analyze trends around performance indicators results
Keep updated the context and interested party’s determination