They started it at my local one this week - I didn't even know they were rolling it out.
For some reason I always find food planning and budgeting so much easier if I can do it online rather than taking a list into a shop.
Dh was the first one to use it at our local one, absolutely loads of slots available. The staff said they'd been waiting all morning to have a go, he didn't get a prize though 
Is so covid safe, he said they even wiped down the back door with disinfectant after they had loaded all the shopping in.
Just thought I'd say incase anyone lives under a rock like me and didn't know they were doing it.