The adverbs 迟早 and 早晚 have the same meaning "sooner or later" and indicate an action that will happen in the future.
In a sentence, 迟早 is followed by either a subject or a predicate expressed by a verb.
She will be caught by the police sooner or later
chízǎo tā huì bèi jǐngfāng zhuā zhù de
He will understand you sooner or later
tā chízǎo huì lǐjiě nǐ de
In a sentence, 早晚 is followed by a predicate expressed by a verb.
If the sentence has a subject, it is placed before 早晚.
He has to go sooner or later
tā zǎowǎn děi qù
She hoped that her husband would come back sooner or later
tā xīnzhōng huái yǒu yí zhǒng xīwàng, rènwéi zhàngfū zǎowǎn huì huílái de