@OP
As others posted here, immediately after you tender your resignation letter, you lose, you forfeit your Bonus even if you're willing to stay working at Citi until the end on February 2027.
What would've been your Bonus will then be redistributed to your other coworkers.
Submit your resignation letter After the Bonus money hits your bank account.
Depending on your job, you may then be required to do Garden Leave which could be 1 to 3 months long.
If yes, this means your earliest new job start date may be March 1.
You would've been required to Sign documentation during your Citi employment with Garden Leave language.