The market is in backwardation, so there is a positive roll yield.
December settled yesterday at 5083.0 vs November at 5098.5
That's a difference of 15.5 points (we could also compare the bid ask midpoints, that would give a difference of 14.5 points. I trust this number less because the bid ask spread for dec is very wide, december is not trading very actively yet, still 10 days to expiration on Nov 16, why did you choose November 5? Would have been better to wait a few more days).
So the roll yield in points is 15.5 points
The roll yield in percentage is 15.5/5098.5 = 0.304%
The "roll cost" is usually understood as the negative of the roll yield, so take the negative of the two numbers above.