The phrase "a final sign off" is correct and usable in written English.
It can be used when referring to the last approval or confirmation needed before proceeding with a project or task.
Example: "Before we can launch the product, we need a final sign off from the management team."
Alternatives: "final approval" or "last confirmation".
A final sign off in the joint text will be made by May and Juncker at a lunch in Brussels on Monday.
In a sign that the budget will contain no significant new announcements one Government source said there were no plans for David Cameron, Nick Clegg and George Osborne to meet for a final sign off meeting before next Wednesday.
While Broadway performances are set to begin Dec. 17, the estate and trust representatives said they still had to give a final sign off this fall for the transfer.
City documents reveal that the DBI and the developers were aware of "larger than expected settlements" in February 2009, before the building received a final sign off by the DBI.
It's a final sign-off before your employment is terminated.
The Stage 2 license, awarded to ForwardGro LLC, is a final sign-off from regulators for putting plants in the ground.
The government's decision to postpone a final sign-off on contracts sends an appalling signal to investors, whom ministers have been so desperate to reassure that Britain is "open for business".
This pact, which still needs approval from other countries involved in nuclear issues and a final sign-off by America's Congress, would provide energy-starved India with nuclear fuel and technology that it badly needs, without forcing it to submit to the strictures of the Nuclear Non-Proliferation Treaty NPTT).
The £27m funding is a final sign-off for the cash so work can start on the ground, although detailed design work is under way.
One of the great things about PR is working on a team: The spontaneous brainstorming sessions, the extra pair of eyes on a press release, the getting a final sign-off on your decision by your boss.
It may end with a final sign-off like LinkedIn: "In light of the pending merger, LinkedIn will not be updating its outlook for fiscal 2016 and will not be hosting a conference call for its second quarter 2016 business results".
