This all depends on the day and who's coming in at what times.
We came in Friday night headed to BLT. We got off our plane at about 8:55 PM and got on a bus about 9:05 (we didn't have any checked baggage). We only had three stops on our bus (WL, BLT, CR) so it was rather quick and we were at BLT by 9:45.
We also had the same food concerns, but we were luckily able to eat a full meal before we got on the plane in Dallas and just eat a few snacks when we got there. With The Wave restaurant closing at 9, I assume they'll operate similar to how Tambu does over at Poly where they quit serving food after the restaurant they're sharing a kitchen with closes, but don't hold me to that. Additionally, aside from a few bars or convenience stores in MCO that stay open late, pretty much every restaurant at MCO is closing between 8-9 PM right now and it was a complete ghost town when we arrived on Friday night.
My best recommendation (which was our main backup plan) would be to look at ordering pizza once you get on the bus and know roughly how many stops it'll be taking before CR.