Once available, updates are released to Carriers and thereafter, it is at the Carriers discretion to release the update to customers. Since updates are released by Carriers in waves, we’re unable to determine when your device will receive an update.
Updates are sent to your carrier from Samsung once they are ready. Then once your carrier is ready to send out the update, they will send it out in waves to multiple devices at a time. You should be recieving it soon. I have tmobile as well and I can say you will be getting it soon here so keep an eye out👍
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I haven't received one myself since dec 13th. I have a different software version than most of the factory unlocked phones of people who have got the update already so maybe that's why.