The average lead across the most recent poll from each pollster within the last two weeks is now 15 points. This is just short of the 16 point lead that is probably needed for a 100+ Conservative majority. Also, Labour are now polling on average slightly above their 2015 GB vote share.
These observations might be thought to provide some concern to Mrs May and comfort to Mr Corbyn. But the average of the final polls in 2015 had Labour a couple of points higher than Labour are now, and the eventual Conservative lead in 2015 was 7 points bigger than it was in the final polls.
A similar discrepancy between the polls and the actual result is not guaranteed to happen again, but it might.