Biggest quantum computer yet was able to figure out that 3 and 5 multiplied gave 15.
I think we will be ok the next 20 years or more

(The 500 qbit computer was a dud, the scientist who discovered the principle behind it, said it did not apply to their solution aka. a big paper weight and no results)
Well I wouldn't necessarily say we'll be fine for the next 20 years, but I can be fairly sure we won't have any issues with Quantum computers for at least another decade.
It's kind of a shame the 500 qbit was a dud, I was hoping that they would be able to usher in a new era of computing soon. But at the same time it does have its own issues, so maybe it is better that it hasn't worked yet.