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Are all the travel preparations complete?
Literal
Trip [possessive-の] preparation [topic-は] all finished [question-か]?
すべて (all/everything) plus 終わる (to end) checks for total completion. 終わる is more general than its near-neighbor 済む — 終わる simply marks 'finished,' while 済む carries an extra nuance of 'properly completed / wrapped up.' Useful pair to keep distinct.