Purchase question

Hey hivemind, had a question that I hope someone can clue me into.

I was a player way back and stopped at Cataclysm. Been gone since. I just restored my account with no purchases, and am noodling around, learning the game, which is totally different.

I know I have Pandaria and Legion now, as legacy expansions, for free, since they are not current.

Q: If I pre-purchase this Shadowlands expac, will I get BfA as well? Trying to figure the shortest path to saving money if possible. Been looking on the WoW website, but haven't gotten a specific answer yet.

Thanks!