The original estimate was mid this week, meaning Wednesday. I have not heard anything to confirm that we are on schedule for that estimation, I have on the other hand not heard anyone say it will be longer either yet, although I have not really spoken to the admins today about that.
Remember it is a rough estimate and not a set date/time, which means it may be a day or two extra until everything is completed. Over all it should at least be mostly done by then, and some servers might be done completely, in regards of transfers, although minor tweaks might be needed.