Being as Rome hasn't canonized him yet, no he's not a canonized saint.
But that doesn't mean he didn't go straight to heaven when he died.
He did die on the feast of the Annunciation, March 25th, which is specifically THE day of the priesthood -- when the Eternal Priest took flesh.
What is a priest? A bridge builder, a pontifex. A link between God and Man.
Was Jesus Christ a priest before He took flesh? I could be wrong, but I think the answer is "no".
Jesus was essentially Priest when He, in His own person, had both Divine and Human natures. He is Priesthood itself. He was the perfect priest, and in fact all priests partake of His priesthood.
What was the aim of the SSPX? To properly form priests according to the pre-Vatican 2 way. The SSPX wasn't a "trad organization" it was a priestly fraternity.
Here's the proof: In the early years, the SSPX didn't even keep the priests they formed -- the priests were incardinated into various dioceses.
So what WAS the SSPX essentially? An organization to preserve the true spirit of the priesthood.
They later became the lead organization defending Tradition, because the priesthood depends on the Faith/Tradition. But that came later.
So the founder of that organization dying on one of the 2 greatest "priestly" feast days (the other being Holy Thursday, which date changes every year) is more than just a coincidence.
I believe it's a classic example of he who has ears to hear, let him hear. God is trying to tell us something: that +ABL was on the right path. And that he was a saint.