AFAIK quantum computers currently can only handle a dozen qubits or less. So we can't really extrapolate about timeframes yet, there's not enough data points to draw a curve. It could happen this year, it could never happen.
By analogy: imagine you want to make an aimbot to shoot people in an online FPS video game. You need your aimbot to calculate not only the vector to shoot at (our game has bullet drop and bullet objects, not hitscan weapons) but also to calculate for the opponent’s motion.
The way people at Google are doing it now, they look at a map of where the players are where when the game starts and try to ammo dump it… with no one there. Lol.