You can track the shipment through the postal service in YOUR country, but maybe NOT until it`s arrived in your country AND registered online there. Some shipments might not be registered online, or updated, in your country until after delivery. If your order is sent through DHL Global Mail, it will still be delivered by your local postal service. DHL only bring it to your country. Trackinginfo might be available at the websites of both DHL and your country`s postal service.
Czech Republic: https://www.postaonline.cz/trackandtrace/
New Zealand: https://www.nzpost.co.nz/
South Africa: https://www.postoffice.co.za/
United Kingdom: https://www3.royalmail.com/track-your-item/portal/rm/track#/
United States: https://www.usps.com/