The Rise of Tiamat book provides a brief description
On page 88 of Rise of Tiamat, brief epilogue passages are provided for both defeat and victory. The "victory" epilogue provides some guidance in this regard, but is relatively general in its description, speaking at the level of the whole Sword Coast rather than anything specific to particular cities.
Beyond that, the Sword Coast Adventurer's Guide
The Sword Coast Adventurer's Guide is dated after RoT due to a specific detail it provides about a city's leadership (tagged for early RoT spoilers):
The SCAG notes Laeral Silverhand as the Open Lord of Waterdeep, having ousted Dagult Neverember. This is an event that takes place within the Rise of Tiamat campaign, and thus the SCAG must detail the state of the world after Rise of Tiamat.
As such, the SCAG can be used as a reference for the state of Faerun post Rise of Tiamat - although it draws few (or no) explicit links between the events of RoT and the world-state.