Correction to my previous post about last update date of delivery information in embedded javascript - I pointed to the wrong file (didn't trace all the way down to the specific javascript section).
The delivery information is embedded in the javascript in main index returned from nginx
View attachment 384014
Data is embedded in this section:
<script type="text/javascript">
window.tesla = {json data here, including delivery information}
Unfortunately this file is generated dynamically from server side so we don't know when Tesla updates it.