This is just snapshot of man page to refer Field description

              CPU
                     Processor  number.  The  keyword  all indicates that statistics are calculated as averages among all
                     processors.
 
              %usr
                     Show the percentage of CPU utilization that occurred while executing at  the  user  level  (applica‐
                     tion).
 
              %nice
                     Show  the  percentage  of  CPU utilization that occurred while executing at the user level with nice
                     priority.
 
              %sys
                     Show the percentage of CPU utilization that occurred while executing at the system  level  (kernel).
                     Note that this does not include time spent servicing hardware and software interrupts.
 
              %iowait
                     Show  the percentage of time that the CPU or CPUs were idle during which the system had an outstand‐
                     ing disk I/O request.
 
              %irq
                     Show the percentage of time spent by the CPU or CPUs to service hardware interrupts.
 
              %soft
                     Show the percentage of time spent by the CPU or CPUs to service software interrupts.
 
              %steal
                     Show the percentage of time spent in involuntary wait by the virtual CPU or CPUs while the  hypervi‐
                     sor was servicing another virtual processor.
 
              %guest
                     Show the percentage of time spent by the CPU or CPUs to run a virtual processor.
 
              %idle
                     Show  the percentage of time that the CPU or CPUs were idle and the system did not have an outstand‐
                     ing disk I/O request.