The first country that comes to my mind is El Salvador, because they were the first country to legalize bitcoin. As for other countries that have legalized cryptocurrency, such as Canada, Australia, or others, they may still be looking and considering whether or not a cryptocurrency reserve is needed in their country. Those countries may not be like Trump who is so hasty to launch a "half-baked bitcoin reserve", they may think more about the framework and discuss it further until it can be launched properly.
I also think the same about El Salvador having s bitcoin reserve since it's the first country that made bitcoin as s legal tender. Even though other countries didn't make bitcoin a legal tender but still they didn't ban the use of bitcoin and ad others have said that they might already have bought bitcoin already and didn't made it public. We can only wait for news if it's really true and if they made it known to public.