Return meta values from Edit Product Category

Looking for some assistance in returning values from Woocommerce "Edit Product Category" page. Able to display fields with the "Edit Product Category" page, but I haven't figured out how to return the value. Here is my register code. Need help to return the value of the id.

add_filter( 'rwmb_meta_boxes', 'bodie_register_meta_boxes' );
function bodie_register_meta_boxes( $meta_boxes )
{
	$meta_boxes[] = array(
		'title'      => 'Standard Fields',
		'taxonomies' => 'product_cat',
		'fields' => array(
			array(
				'name' => __( 'Dark Overlay?', 'bodie_theme' ),
				'id'   => 'dark_overlay',
				'type' => 'checkbox',
			)
		),
	);
	return $meta_boxes;
}

Failed
// echo get_post_meta($post->ID, 'dark_overlay', true);
// echo get_post_meta($term_id->ID, 'dark_overlay', true);