The 1st batch of BIOS releasing models are MEG Z790 GODLIKE MAX, MEG Z790 ACE MAX, MPG Z790 CARBON MAX WIFI II, MPG Z790 CARBON WIFI, MAG Z790 TOMAHAWK MAX WIFI and Z790MPOWER. All BIOS of Intel 700 and 600 series motherboards and 14th /13th Generation Desktop PC will be released soon in coming weeks by the end of August. MSI will continue to update our users on the latest news.
The way I understand it is that once they release an update for your board, it should cover all the processors compatible with it, not just the one you have specifically.