Before the virus we would order online and do curbside, but they seem to have discontinued the service. There is constantly the message: no slots available check back later and I do... often.
Here is how to get past that memo. I wait to order for Sunday pickup at 12;05 AM on Friday night Saturday morning. So before I went to bed last night (Friday night) I waited until 12:05 and went online and placed my order for the slot I chose on Sunday.