How to get the args of my custom post types

I find a way to get the $args of an existing custom post type.

I tried first to use the get_post_types() function, but it was always listing the built-in post types even when I pass the '_builtin' => false in the function args like this:

$args = array(
   '_builtin' => false
);
$post_types = get_post_types( $args );

I found that we can use global $wp_post_types like this:
$wp_post_types['custom_post_type_slug']->arg_slug;.

For example:

$wp_post_types['custom_post_type_slug']->labels;
$wp_post_types['custom_post_type_slug']->menu_icon;
$wp_post_types['custom_post_type_slug']->show_in_menu;
...