Intergalactic Medium (IGM)-based cosmology established itself as a powerful cosmological probe at high redshift (z >2) with the wide success of the SDSS-III Baryon Oscillation Spectroscopic Survey (BOSS), followed by the extended BOSS (eBOSS). The ongoing Dark Energy Spectroscopic Instrument (DESI) survey, now in its second year of operation, offers an opportunity to review the achievements of SDSS-III and put in context the progress that is underway with DESI. I will give an overview of Lyman-alpha forest early results from DESI and discuss what comes next.