The TRR Overview and related Deployment Plan Overview mention the new delivered API. They should both explicitly mention the second deliverable: a new command-line tool installed on gateways. Both of these deliverables are being tested and deployed in production.
This second deliverable should also be part of the deployment plan, although in this case it may make sense to only mention how the new command-line tool will be distributed to gateways.
The deployment plan could track gateway deployments of the new client, or totally ignore it and assume it's up to gateways to transition as desired.
Should section "G. Schedule" have specific dates?