You are quite correct; the change is because of the weekend. On line applications can be reviewed on 4th March - so no real advantage in terms of time to applying on line
Why 4th March for online? This year the online result (Essex) was there on 1 March, before 09:00 hrs. No need to wait for the email (which arrived at 18:10) or post! I assume that for it to appear before 0900 on 1 March, it must have been updated prior to that and perhaps scheduled to auto-update after midnight, 28 February?
I would advise anyone to apply online. I am so glad we did. No nail-biting wait for the postman or constantly staring at in-box for email. Just use your log-on given when you apply and the allocation result will be there.
If it all becomes too much - REHAB will be there for you!