As an international standard, ISO 45001 is written to be used by any organization in any industry. As such, it will tell you what needs to be done in a process for OH&S, but not how to do it. So, ISO 45001 does not give details on how to conduct monitoring and evaluation, only providing requirements that you must determine what to monitor and evaluate and that you must ensure evaluation is adequate. As conducting monitoring and evaluation is something that will be specific to each organization, I cannot give you a specific procedure for M&E, nor what criteria to evaluate against as this will differ from industry to industry, as well as area of the world. The best I can recommend is to look at industry best practices that are in place where you are located and work with these to develop the M&E process that will be best for you. Remember, the reason that ISO includes monitoring, measurement, analysis, and performance evaluation into the standard is to collect data that can be used to make good evidence-based decisions. So, choosing the right data and the right evaluation method is critical for this to be effective.
You can read a bit more on how monitoring and measurement work in the article: