Omni-Man
Early Access: November 9, 2023
Regular Release: November 16, 2023

Quan Chi
Early Access: December 14, 2023
Regular Release: December 21, 2023

Peacemaker
Early Access: Winter 2023

Ermac
Early Access: Spring 2024

Homelander
Early Access: Spring 2024

Takeda Takahashi
Early Access: Summer 2024

Tremor: November 20, 2023

Khameleon: January, 2024

Mavado: TBA

Ferra: TBA

Janet Cage: TBA

Source: https://gamerant.com/mk1-mortal-kombat-1-all-dlc-characters-release-date-kombat-pack-schedule/