We need to keep in mind that, as part of this deal, the UK has undertaken to accept some of the migrants already in Rwanda, notably those who have "complex medical and psychological needs.":
https://www.thetimes.co.uk/article/vulnerable-rwanda-refugees-head-to-uk-wq7vq2njb#:~:text=Under%20the%20terms%20of%20the,being%20sent%20the%20other%20way.
"Under the terms of the immigration deal that Priti Patel, the home secretary, signed last week in Kigali, the UK has agreed to take in “a portion” of Rwanda’s most vulnerable refugees in exchange for illegal migrants being sent the other way.
Most are expected to be Congolese refugees who have been living in makeshift camps in Rwanda for years or those who have specific health conditions that would benefit from being transferred to the UK. A Home Office source last night said the number would be “less than 50”. Congolese citizens make up more than half of the 130,000 refugees in Rwanda."
But as I said, there's a long time between now and Tuesday. Unfortunately I'm away next week and will probably not be able to keep proper track of events.