When is the deadline to transfer SoM characters?

[Asma-bloodsail-buccaneers]

Season of Mastery Realms to Become Transfer-Only

As the Season of Mastery WoW Classic experience approaches its end, we will disable the “Enter World” button for all Season of Mastery realms on or after February 14, 2023. After that time, you will be unable to enter the game from the character selection screen. We intend to keep your Season of Mastery character list available for some time thereafter, so that you can initiate free transfers from Season of Mastery realms to Classic Era or Wrath Classic realms. We do not yet know how long that …

This is all we have to go by at the moment.
Make your best guess.
Good luck.