If you enabled Find My before the phone was stolen you can track it. See the post from joel12mat.
Here’s more information→If your iPhone, iPad, or iPod touch is lost or stolen - Apple Support
Also, be alert for any messages from “Apple” or “Apple Security” saying your phone has been found, with a link to track it. All such messages are SCAMS to steal your Apple ID so the thief can disable Activation Lock and also steal your data from iCloud. Ignore and delete them, or forward them to reportphishing@apple.com so Apple can take down the bogus sites.