global $wp_meta_boxes returns NULL

When I call global $wp_meta_boxes; it returns null.
I’m trying to calling like:

class my_class()
public function __construct(){
add_action( ‘wp_dashboard_setup’ , array( $this , ‘my_meta_boxes’ ));
public function my_meta_boxes(){
global $wp_meta_boxes;
return $wp_meta_boxes;

The class is working fine, but I cannot make it work.
I appreciate any suggestion.

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