Mothers Day Lunch- I know this is a long shot but, nice environment/Astros game/decent food near downtown?

Thanks to a great user here that recommended the cistern tours, I am planning on doing that. We are trying to decide if we want to do it on mother's day specifically or wait- mainly due to the fact we are going to want/need to eat while in town and Mother's Day is obviously notoriously slammed for our service industry friends.

So my question is is there any chance of us getting into any place that first off a) has good food b) some place we could walk in with a fairly minimum wait or make a reservation for and c) would be showing the Astros game. (Yes, she loves the Astros too- this isn't just for me and my old man)

My first thought is St Arnold's but it is looking like its going to be pretty warm and I'm unsure of availability. I know it's busy on Sundays as it is, so I gotta imagine it's gonna be slammed on Mothers Day. She also isnt a huge fan of beer any more unfortunately but I know St Arn's has some wine/seltzer/cider alternative.

Any ideas? For those grizzled SA vets, what time (if ever) does Mother's Day crowd kind of die down? Think we could miss it a bit if we waited till mid afternoon around 3?