Sentence examples for that later from inspiring English sources

The phrase "that later" is correct and can be used in written English.
It is typically used to refer to something that will happen or be mentioned later in the sentence. Example: John promised to send me the report that later afternoon. In this sentence, "that later" is used to specify which afternoon John will send the report, rather than just saying "later," which could refer to any unspecified time in the future.