Laaz, I had briefly thought that too, but this tree flowered in Mid June, probably 1.5-2 months behind when most Satsumas down south flowered (takes a while for things to warm up here in the Spring).
It's been ~150 days since the flowers began to open with the St. Ann
In comparison, my container Armstrong Early flowered in Mid-Late March and had mature fruit in Mid Sept. (~170 days).
In the future, I'll probably also try Xie Shan and the Armstrong outside.
Mark, I'm surprised you don't have at least one or two already.
Satsumas are one of the earliest sweet citrus to have mature fruit in the Fall.