Can I review, accept and deny the GMS changes before pushing to firewalls with workflow license?

Workflow does require a separate license for use.  When licensed it allows for review of changes before they are sent out to the firewalls.

With Workflow, changed can be viewed by a second administrator and approved, rejected or modified before those changes are pushed.

Workflow instructions can be found starting on page 25 of the GMS Admin Guide linked below.

https://www.sonicwall.com/techdocs/pdf/global-management-system-console-administration.pdf