One of these landers, built by the company Astrobotic in Pittsburgh, Pennsylvania, was anticipated to take off in early May, but delays in readying its rocket means the launch will probably slide by several months at least. That could mean that a lunar lander from Intuitive Machines, in Houston, Texas, is first up to launch, perhaps as early as June.
Source: Nature Moon mission failure: why is it so hard to pull off a lunar landing?
What does "is first up to launch" mean here? I've checked up the meaning of the phrase "UP TO (DOING) SOMETHING" in Cambridge English Dictionary, which explains "to be doing something, often something bad or illegal, usually secretly: She's up to no good (= doing something bad or forbidden)", but Intuitive Machines doesn't seem to be doing something bad or illegal. The best guess I've got now is that IM's launch will be forced to be the first (they don't want to be the first, yet the situation forces them). What does it really mean?
to be
.