only pull meta for specific page-template superCpt

gistfile1.txt

if(class_exists( 'Super_Custom_Post_Type' )){
	add_action( 'after_setup_theme','trusted_page_sup' );
	function trusted_page_sup() {
		if ( isset( $_GET['post'] ) )
			$post_id = $_GET['post'];
		elseif ( isset( $_POST['post_ID'] ) )
			$post_id = $_POST['post_ID'];
		else
			$post_id = get_the_ID();

		if ( ! $post_id )
			return;

		if ( 'page' != get_post_type( $post_id ) )
			return;

		if ( 'page-homepage.php' == get_post_meta( $post_id, '_wp_page_template', true ) ) {
			$homepage_meta = new Super_Custom_Post_Meta( 'page' );
			$homepage_meta->add_meta_boxes( $attr = array(
				'id' => 'Homepage Boxes',
				'context' => 'normal',
				'priority'=> 'low',
				'post-type' => 'page',
				'fields' => array(
					'box-1-thumbnail' => array('type' => 'media'),
					'box-1-title' => array('placeholder' => 'Title'),
					'box-1-message' => array('type' => 'textarea'), 
					'box-1-type-of-button' => array('type' => 'select', 'options' => array( 1 =>'link', 2 => 'button'), 'prompt' => false),
					'box-1-button-text' => array('placeholder' => 'Button Text'),
					'box-1-button-link' => array('placeholder' => 'Button Link'), 
			)
				),
			$attr2 = array(
				'id' => 'Homepage Boxes 2',
				'context' => 'normal',
				'priority'=> 'low',
				'post-type' => 'page',
				'fields' => array(
					'box-2-thumbnail' => array('type' => 'media'),
					'box-2-title' => array('placeholder' => 'Title'),
					'box-2-message' => array('type' => 'textarea'), 
					'box-2-type-of-button' => array('type' => 'select', 'options' => array( 1 =>'link', 2 => 'button'), 'prompt' => false),
					'box-2-button-text' => array('placeholder' => 'Button Text'),
					'box-2-button-link' => array('placeholder' => 'Button Link'), 
			)
				),
			$attr = array(
				'id' => 'Homepage Boxes 3',
				'context' => 'normal',
				'priority'=> 'low',
				'post-type' => 'page',
				'fields' => array(
					'box-3-thumbnail' => array('type' => 'media'),
					'box-3-title' => array('placeholder' => 'Title'),
					'box-3-message' => array('type' => 'textarea'), 
					'box-3-type-of-button' => array('type' => 'select', 'options' => array( 1 =>'link', 2 => 'button'), 'prompt' => false),
					'box-3-button-text' => array('placeholder' => 'Button Text'),
					'box-3-button-link' => array('placeholder' => 'Button Link'), 
			)
				));
		}
	}
}