Astra Blog Posts order_by_last_update

function astra_custom_blog_order_by_last_update( $query ) {
    if ( $query->is_home() && $query->is_main_query() ) {
        $query->set( 'orderby', 'modified' );
        $query->set( 'order', 'DESC' );
    }
}
add_action( 'pre_get_posts', 'astra_custom_blog_order_by_last_update' );