According to the announcement, there will be new migration tools that will help admins to convert existing Workflow Rules and Process Builders into Flows.
Here is the roadmap for these changes.
- Migrate from Workflow Rules to Flows in Spring ’22
- Migrate from Process Builders to Flows in Summer ’22
- Disable the option to create new Workflow Rules and Process Builder in Winter ’23
https://salesforcetime.com/2021/09/23/th ... builder/