OMEGAMON for APM V5.4.0 was released in September 2016 as an "on-prem" offering, enabling resource monitoring for z-based application components. Last week, the cloud offering for Application Performance Management was refreshed and OMEGAMON for APM will be available as a "z system extension pack" for SaaS subscriptions.
Even if a SaaS offering does not fit your needs, the Cloud Marketplace does include a "Live Demo" environment. This is a great opportunity for you to explore the whole IBM APM product and become familiar with how OMEGAMON APM resource monitoring fits into the picture. More importantly, you can see how the existing transaction tracking support works. You may wish to be familiar with this as transaction tracking for z/OS is designed and developed.