top commands by default is in Irix mode, it expressed as a percentage of total CPU time.
according to https://linux.die.net/man/1/top, you may switch Irix mode to off (Solaris mode), where a task’s usage will be divided by the total number of CPUs, that’s the average CPU usage we’re looking to.
besides, it also depends-on your system configuration.
please refer to Supported Modes and Power Efficiency, you may setting device as performance mode (i.e. MaxN); using “top” commands and switch Irix mode to off by “I” (shift+i) to check the CPU usage in average.