He's improved his position a bit, but he's still basically losing.
How so?
He's still under 50% of total first-ballot delegates, whether you count just pledged or include the unpledged that have also made an endorsement. He cannot exceed 50% on the first number tomorrow, and it's unlikely for him to exceed it on the second. Even if he does, he's on track to do poorly in most of the May primaries (except West Virginia), and have negative momentum going in to California, where he needs to do well.
If he can't get to 50%+1 on the first ballot -- and odds are he can't -- then the whole thing falls apart and he loses. It was always a longshot, tbh.