@anishmonachan It is already there 
You are probably confused by the versioning: Mender 2.6 comes with mender-client 2.5.0, which landed in meta-mender couple of days ago. See this table for the server/client versions match.
The new recipes are in master and dunfell, and we will port them to the zeus and warrior in the next monthly update.
By the way, to enable remote terminal you also need to install the mender-connect add-on, which is installed by default if you use meta-mender-demo layer. Otherwise you have to add it to your image.
Let us know if you need help!