https://sos.ga.gov/admin/files/2020%20Revised%20Short%20Calendar.pdf

Well, if I’m reading this correctly, early voting in Georgia starts pretty soon:

«November 18, 2020 Earliest day for a registrar to mail an absentee ballot for the General Election Runoff for
Federal Offices. O.C.G.A. § 21-2-384

December 14, 2020 Advanced In Person (Early) Voting begins for the General Election Runoff for Federal Offices.
O.C.G.A. § 21-2-385»