Right so I've done another little cross check with sales from the Forest FA Cup Semi Final, given our current position in the criteria is 8,000 points with no cup scheme.
Forest Semi Final
10th April 1pm - 10,000 points + No Cup Scheme - 17,782 Left (+ Roughly 7,000 not on sale)
15th April 3pm - All Matchday Members - 5,829 Left (+ Roughly 7,000 not on sale)
This means that about 12,000 tickets sold between our current position and the matchday members window. Given there is more demand for this game I'd expect this number to be greater on this occasion.
As we currently have around 11,600 tickets left I'm going to predict that this will sell out in the 1pm window tomorrow (Apart from the expensive Level 2 Seats).