How do I get information specific to CPU core via command
You can install the program htop from Homebrew, which will give you this information.

When you have Homebrew installed, run the following command to install:

brew install htop


Afterwards you can run the program like this:

htop


If you go into the Setup menu by typing S and select Display Options, you can enable detailed CPU information. The CPU usage bar then displays information about the CPU usage, system (i.e. kernel) time, io time, etc.