QCs are in all major data centers already. Although there is not much you can do with them, but you can use them. IONQ is considered the leader right now in QC. Look them up, very interesting stuff they are doing. They just partnered with astrazeneca to start developing useful applications. They will also demonstrate hybrid algorithms next week where they offload some stuff to QPUs to speed up models. I would say within two years QCs will start being useful.