The marketing tends to matter more than the metal. If the fights were marketed and operated by BA, if the flight hasn’t credited this morning it probably won’t until Monday (I rarely see flights credit on Sundays for some reason), and I would expect the Sunday flight to credit on Tue.

If the flights are marketed by another airline, it will vary according to that airline. In particular, IB marketed/ticketed flights on BA metal won’t credit automatically, and will need a retrospective claim.