The launch of SPHEREX has been pushed back to Tuesday night. For a quick rundown of (one of) the mission’s primary drivers, see this recent article in Science. Of course, the spacecraft and its spectrometer are useful for multiple investigations, like asteroid/comet gauging and chemistry.
https://www.science.org/content/article/modest-telescope-big-plans-spherex-will-probe-cosmic-inflation-after-big-bang
21 Feb Clery, Daniel Modest telescope with big plans, SPHEREx will probe cosmic ‘inflation’ after Big Bang zuhdly1