I had a similar idea on Saturday and wrote a puppeteer based script which monitors Tesco.com and then pushes a screenshot to my phone if it finds a slot: https://github.com/paulmaunders/delivery-slot-bot
hey - just tested your code - works great. I am no coder, but have installed and it runs fine.
Quick question
1) Its now only checking for Group-1 which is 1hr fixed. Would like to include Group-4 which is the flexible slot.
2) Not just send notification - book the earliest one available.
How to do this?