According to Breitbart here, it's going to take until about April 15th for the Missouri GOP primary results to be certified by the Secretary of State.
The Missouri GOP shows here that Trump won 37 delegates. Real Clear Politics credits Trump with only 25 from Missouri.
Add those 12 to Trump's current 736, and you get 748, which is 48.5% of the 1541 already allocated:
Trump: has 736 + 12 (48.5%)
Cruz: 463 (30%)
Rubio: 171 (11.1%)
Kasich: 143 (9.3%)
Carson: 9 (0.6%)
Bush: 4 (0.3%)
Fiorina: 1 (0.1%)
Huckabee: 1 (0.1%)
Paul: 1 (0.1%).
That leaves just 931 available, of which Trump needs 489 to get to 1237, or 52.5%:
Trump: needs 489 (52.5% of 931 . . . 1.1 times his current level of support, still very likely)
Cruz: needs 774 (83.1% of 931 . . . 2.8 times his current level of support, nearly impossible)
Kasich: needs 1094 (117.5% of 931 . . . 12.6 times his current level of support, impossible).
The only thing Cruz and Kasich are doing is possibly keeping Trump from making it to 1237.
If they want a needlessly and horribly divided GOP going into the convention, they should continue to play the spoilers. If they do that, they'll be to blame for the catastrophe.
But if they really want to have a chance against the Democrats in the fall, they should unite NOW around Donald Trump.