"Empty" doesn't mean it has zero in it. The "empty" may be a bit
misleading. The TXIF bit is set if the USART is ready to accept another
character. Note that it may still be transmitting the previous one. When
it is finished transmitting the character, data in the transmit holding
register is transferred to the transmit shift register for transmission.

So, there are two bit available that tell you what the transmit side of
the usart is doing.

TXIF is set if the usart is ready for another character.

TRMT is set if the usart has finished transmitting and has nothing else to
transmit.

Harold



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