You’d be entirely correct, and that’s exactly why there’s an ongoing debate in physics and cosmology as to why there’s so much matter, and so little antimatter in the universe.

Unfortunately for us, the sun isn’t an egg timer, and it’s pretty much completely impossible to determine exactly when and how strong the next solar flare is until it’s hurtling through space and potentially in our direction (beyond general trends like solar cycles and such). Would be great if it worked like that though.