Yes, that seems correct. Based on what I've been able to find, first-round offers were made on the following days during the past four years:
2014: Wednesday March 12th
2013: Wednesday March 6th
2012: Monday March 5th
2011: Tuesday March 8th
(This information could be incorrect, though. Please take it with a grain of salt.)
If I was a betting person, I would bet that first-round offers go out either tomorrow (Wednesday, March 4th) or next Wednesday (March 11th).