Path to php cli is path of php in your system. You can either look by yourself an save it in configuration.php or ask your server provider to enable it for your instance.
Here are some example-
Xampp on mac: Mac- public $php_executable = '/Applications/XAMPP/bin/php';
Wamp on Windows- public $php_executable = 'C:\wamp64\bin\php\php7.3.12/php.exe';
Hope this helps thanks