There are three full weeks left in the 2021 legislative session in Oklahoma, which has been jam-packed and controversial.But the most important part of the session is not done just yet. Publicly, things have slowed down at the state Capitol, but that's as lawmakers behind the scenes are in budget negotiations to finalize the massive state budget from 2022.A few big points have emerged on that as the clock ticks towards sine die, which is a formal way of saying "pencils down."The state constitution requires lawmakers to wrap things up by 5 p.m. May 28. By then, the House of Representatives, the Senate and the governor have to come to an agreement on the budget.In February, Gov. Kevin Stitt proposed an $8.3 billion state budget, with a $300 million deposit to savings – a conservative plan as the state digs itself out of the coronavirus slump.It's all expected to be smoother sailing than last year when the session was upended by the COVID-19 pandemic. Stitt vetoed the budget, and the legislature overrode the veto.The deadline is sine die.One sticking point, as it often is, could be education funding. The House said a must-have for them is a $135 million boost to education funding. Senate leaders said they're receptive to getting more money into the classroom.House Majority Floor Leader Jon Echols, R-Oklahoma City, tweeted over the weekend that "I don’t want to give the many advocates fighting for this the idea that it is a done deal. We still need advocacy to help get it across the goal line."Another outstanding question is how will lawmakers fund the more than $150 million Medicaid expansion that voters put in the state constitution last year? If they don't get it done by the end of the session, lawmakers will have to come back to the Capitol for a special session, and they have a hard deadline of July 1.