Believe it or not, it's not uncommon. A flight I took last Wednesday, just posted early this morning. In another thread, poster "alc" provided this insight which I found helpful.
"Yes, it does seems they only update Tuesday to Saturday and on a 4-days from the day your AC flight landed. If it the 4th day is on Sunday or Monday, that get update on Tuesday. I am currently waiting for my flights from last Thursday as well. And like yours, my Tuesday flights got posted Saturday morning."
And yes, I agree, if this is the best IT a commercial airline can offer it's truly a wonder we're not all lost or deceased.