This tense is often used with the following time expressions:
... by Monday, Tuesday, etc.
... by the time ...
... by five o'clock, two-thirty, etc.
Subject + will + have + past participle + object(s) + time Expression
They will have finished the report by tomorrow afternoon.
Subject + will not (won't) + have + past participle + object(s) + time Expression
Mary won't have answered all the questions by the end of this hour.
(Question Word) + will + subject + have + past participle + object(s) + time Expression
What will you have done by the end of this month?