It depends on your use case. By some measure, the Google collaboration that demonstrated a time crystal was a practical quantum advantage in the space of conden

It depends on your use case. By some measure, the Google collaboration that demonstrated a time crystal was a practical quantum advantage in the space of condensed matter research. But in that space, practical means validating theory with experiment. That's a much lower bar for a quantum advantage than, say, showing that you've implemented a quantum algorithm that can, with high statistical likelihood (e.g. an error rate of 1/10e5), provide fleet routing solutions for a logistics company that are 10% more efficient than any known classical routing algorithm.