We are decades away from it, if it ever happens. Taproot addresses are not hashed.
Not revealing the public keys isn't a serious defense. Miners can just try to re-mine the block after you've spent.
In case you missed it, check out nostr:npub1qqqqqqqrxtrcx8vut2vlrqa0c2qn5mmf59hdmflkls8dsyg9vmnqsclxwk and Surmount Systems' presentation on the Quantum Threat to #bitcoin and how we can prepare with their proposed bips!
spoiler: if you resuse on chain addresses, STOP NOW
Discussion
It's at least some defense. Even after this presentation, I'm not super well versed in the quatum attacks but I'm glad they're talking about it and coming up with some ways to prevent/resist it for when the quantum attacks do come.