Ossoff wins 52-48. I doubt every single Republican who voted in the first round will vote for Handel, and right now Ossoff has all the momentum.
I think this is an understated factor in the race. If you add the 0.8% that voted for other Dems and the 0.9% who voted for the hardcore NeverTrump McMullin-endorsed candidate Abroms, Ossoff is basically there for the runoff, not to mention a few Bob Gray supporters staying home in the runoff. I think it would be very hard for him to get to 52%, though.
I think you could also add in the .2% of the Woke Muslim guy to Ossoff.