JW Facts did a pretty good breakdown of what NGO status meant.
https://www.jwfacts.com/watchtower/united-nations-association.php
Among other things:
As the letter outlines, Watchtower was an associated NGO, and to become associated required Watchtower accept the following:
- that the NGO share the ideals of the UN Charter;
- have a demonstrated interest in United Nations issues and a proven ability to reach target or specialized audiences, such as educators, media representatives, policy makers and the business community;
- have the commitment and means to conduct effective information programs about UN activities by publishing newsletters, bulletins and pamphlets, organizing conferences, seminars and round tables; and enlisting cooperation of the media.
The opening paragraph of the 1991 application form, which the Watchtower was required to submit, contains an instruction to provide information yearly to the United Nations. It states:
"provide us with proof of your organizations non-profit status and with an annual report on its activities related to United Nations."
He also shows how their coverage of the UN changed during the time that the WTS was an NGO.