Do you have access to MyIDtravel? That usually gives you a good idea. My wife is a former SAS employee and is still good friends with many still working there, I will see if she can find exact numbers for you. Right now all are showing as good on MyIDtravel.

Just a couple of rules of thumb however - ORD has the highest no-show rate of any SAS station (usually missed connections from UAL flights) so typically that will be your safest bet. But there are two flights per day from EWR so you have a late night back up if you cannot make the first one. Also if you are on MyIDtravel click on the flight number and look at the number of seats available per code. The higher the numbers, the more seats available for sale. If my memory is correct the N class is discounted positive space SAS employee tickets and they are all showing zeros on the date you are asking about.

Give me a day or so to see if I can get you exact numbers.