Snippet to update live tracking status from backend for specified number of previous days. PluginHive plugin used - WooCommerce Shipment Tracking Pro - https://www.pluginhive.com/product/woocommerce-shipment-tracking-pro/

functions.php

/**
 * Snippet to update live tracking status from backend for specified number of previous days. To trigger the manual update go to Woocommerce->Orders page and add &update_tracking_manually=yes in url and press enter.
 * Created at : 20 July 2018
 * Updated at : 20 July 2018
 * PluginHive Plugins : https://www.pluginhive.com/plugins/
 * Gist Link : https://gist.github.com/xadapter/e86aac0f4e7381c3533373ae7f6edc12
 */
add_action( 'init', 'ph_update_live_tracking_status', 100 );

function ph_update_live_tracking_status() {

	$last_days = 2;			// Last how many days order tracking need to be updated

	if( ! empty($_GET['update_tracking_manually']) && is_admin() && $_GET['update_tracking_manually'] ) {

		$today_date = new DateTime();
		$today_date->modify("- $last_days days");
		
		if( class_exists('WfTrackingUtil') ) {
			$orders_to_update = wc_get_orders( array(
				'numberposts' => - 1,
				'date_after'	=>	$today_date->format("Y-m-d")
			) );
			foreach( $orders_to_update as $order ) {
				$order_id = $order->get_id();
				$shipment_source_data 	= $order->get_meta('wf_wc_shipment_source');
				$live_api_supported_services = array( 'ups', 'fedex', 'united-states-postal-service-usps' );
				if( ! empty($shipment_source_data) && in_array( $shipment_source_data['shipping_service'], $live_api_supported_services ) ) {
					$shipment_result 	= WfTrackingUtil::get_shipment_result( $shipment_source_data );
					if ( null != $shipment_result && is_object( $shipment_result ) ) {
						$shipment_result_array = WfTrackingUtil::convert_shipment_result_obj_to_array ( $shipment_result );
						update_post_meta( $order_id, 'wf_wc_shipment_result', $shipment_result_array );
					}
				}
			}
		}
	}
}

To trigger the manual update go to Woocommerce->Orders page and add &update_tracking_manually=yes in url and press enter.