In an update posted to Teams User Voice, Microsoft said that they had enabled offline capabilities for messaging with access to recent chats and channel conversations. This is good, but the problem is that Teams is much more than chats and offline access remains problematic for many of the components people access through Teams. Until all apps support offline access, functionality will remain limited.
https://office365itpros.com/2020/10/19/teams-basic-offline-capabilities/
