Yes, it is advisable to keep the jtokens taken for supplying in the wallet. This is because holding the tokens in the wallet allows you to take advantage of the benefits associated with the tokens such as receiving rewards for supplying and staking them. Furthermore, keeping the tokens in the wallet also helps to ensure that the tokens are secure and not exposed to any potential fraud or theft. Additionally, it is important to note that the jtokens are designed to be used in decentralized applications and keeping them in the wallet ensures that they are available for use when needed.