They're big, but you went a bit over there. Odyssey is like 96 with all the DLC, and RDR2...doesn't have DLC, does it? That one is sitting at around 120 for me atm.
Xbox store has AC Odyssey Gold Edition (the edition that includes DLC) listed as requiring 141 GB of space I think. Maybe their listing is off though, maybe Ubisoft managed to shrink it some with better compression and it came in smaller than they originally planned when the listing was made.
I was referring to RDR2 Online updates when I said DLC there, I assume the stuff they have been adding for online has been adding to the file size. I don't have it installed currently, but I heard it was very big.