A memorandum of understanding that has been in the drafting process by the two sides this week must be signed before training camps open.
The players' association wanted as much of the document as possible to be completed before voting began.
Leading up to Thursday's start time for voting, the union has been busy calling players and agents to educate them about the changes and additions to the tentative agreement.
Assuming the deal is approved by the players, as expected, there will be only six days between the opening of camps and the start of the season. No preseason games will be played.