Don't worry about it.
To answer your questions, no you don't tip the delivery driver. Just be ready to open the door when you see the van pull up. They haven't a lot of time to spare, but if asked, will bring the crates of goods into the kitchen for you. I stand at the door and - it's never the same person - I say 'straight through to the kitchen and on to the kitchen table, please'. It's all packed separately, for the freezer, for the fridge, the fresh fruit/veg, and then the jars, bottles and cans.
DH resisted it for a long time saying he liked to go and see what there is. Yes, but, it defeated him with all the leg problems over recent months. Now he's gone back to going to Tesco but only for a few bits of fresh fruit or any other oddments. Carrying heavy bags from the car is beyond him.
We use Tesco, but we have used Ocado in the past. You book a delivery slot, they confirm by email and they send a text to say it will be delivered at such-and-scuh time.
I've always hated shopping. I get panicked by crowds of people e.g. supermarkets, motorway services, and online shopping is the best thing since, as they say, sliced bread.