If you were to ask 100 people on the street, a few might be familiar enough with Jehovah's Witnesses to know that they distribute literature, but not one of them would understand the message itself.
Only if you managed to find 100 people none of whom are JWs, former JWs, have family members who are JWs, or ever had a significant friendship with a JW through work or other contact, which is pretty unlikely, in the US and many other countries. In my experience, a surprisingly high number of “normal” people have been preached to one way or another through various kinds of contacts with JWs. In any context with a dozen strangers, or more, my experience is that the chances are pretty good of coming across someone who knows about JWs for one reason or another, if the topic comes up. A rough outline of the idea that Jehovah’s Witnesses believe Armageddon is coming and that you need to join them if you want to survive it is pretty widely know, I would suggest. Cultural references in mainstream media to JWs that allude to the idea of Armageddon are also a good indication that the basic message is widely dispersed.