Secret information USUALLY depreciates in value pretty rapidly. Technological advancement is a moving target, so if you don't get that information for 5 years, you are still 5 years behind.
The biggest weakness to quantum computers is our dependence on asymmetric encryption (like RSA and ECC) and how hard they are to develop and prove that they are, if not unbreakable, at least extremely hard to break for the forseable future. Currently, the most common symmetric algorithms do not appear to be vulnerabile to quantum algorithms (at least not vulnerable enough that it couldn't be mitigated by doubling the key length which is relatively easy).
There is a LOT of work going on behind the scenes to replace the aging RSA and the newer, but still vulnerable, ECC algorithms to harden against quantum computing. Even if there is a period of vulnerability, personal quantum computers (PQCs) are still a very long way off. It's not safe to bet against technological advances in the computing space, but I dare say that is at least 25 years down the road. Your biggest concern will be state actors and rogue professionals abusing their access to quantum computers (like IT professionals installing cryptocurrency miners on systems they have access to). The Microsoft Support scammers in India won't be using quantum computers to steal your credit card information for a very long time.