When ordering in Tbilisi (without surroundings that might officially count to Tbilisi) before 19.00, delivery is carried out by courier on the same day. Delivery cost - 3 GEL. When buying from 100 GEL, delivery is free.
Transportation to the rest of Georgia and abroad is provided by the Georgian Post. You can see the rates for delivery services here https://www.gpost.ge/?site-path=help/calc/&site-lang=en