I got an email from Google earlier this morning & I've checked it out.
As far as I can tell, it's 100% legit -but - I wouldn't click on any of the links in it if you get this email - just to be extra careful.
On Nov 9th, Google is going to put in a two step sign in. The normal sign in - followed by a phone verification.
If anyone is at all like me - I have had three cell phones and two landline numbers over the last 20 years & sometimes forget which one I may have used years ago to first sign up - you might want to go to your Google settings and make sure everything is current.