I submitted all of my packs updated for 4.9 the day 4.9 was released but i haven’t been notified by Epic as to whether or not they have been updated on the marketplace yet, i will post here once i have been notified.
There are no assets in my packs which will break in 4.9 though so if you don’t want to wait for them to be updated on the marketplace you can always install them in a 4.7 project then convert to 4.9.