tracker.js

const puppeteer = require('puppeteer');
const statusTextSelector = '.someClassname';
const trackingUrl = 'http://ozcouriers.com.au';

const extractStatus = async () => {
  const browser = await puppeteer.launch();
  const page = await browser.newPage();

  await page.goto(trackingUrl, {waitUntil: 'networkidle2'});
  await page.waitFor(statusTextSelector);

  const statusText = await page.evaluate((statusTextSelector) => {
    const statusDiv = document.querySelector(statusTextSelector);
    // returned data must be valid JSON
    return [statusDiv.textContent];
  }, statusTextSelector);

  await browser.close();
  return statusText.join();
};