Custom Meta on AMP Mode || Remove Meta Author and Time on AMP Mode

/* Custom Meta on AMP Mode || Remove Meta Author and Time on AMP Mode */
function custom_meta_in_amp_mode( $meta ) {
    if ( ( $key = array_search( 'meta-author', $meta ) ) !== false ) {
        unset( $meta[ $key ] );
    }
    if ( ( $key = array_search( 'meta-time', $meta ) ) !== false ) {
        unset( $meta[ $key ] );
    }
    return $meta;
}
add_filter( 'amp_post_article_header_meta', 'custom_meta_in_amp_mode' );