iOS UI Testing monitor CPU & Memory usage for app process

I've followed iOS - Get CPU usage from application to track CPU usage for my ios app.

I want to do continuous integration for my app to monitor CPU usage. However if I use this code in UI testing it can only measure the metrics in UI testing process but not the app process.
Is it possible to get the cpu usage for app process (I assume it is child process of UI testing process since it launches app)?