Wild men who caught and sang the sun in flight,

the meter, if any, from this line is

This line from Do Not Go Gentle into That Good Night is written in iambic pentameter.
An iamb is a foot (rhythmic unit) of two syllables; the first one being unstressed and the second one stressed. Penta = 5. This means that, in this line, we have 5 sets of iambic feet, which should read like this (lowercase unstressed, capital letters stressed):

wild MEN who CAUGHT and SANG the SUN in FLIGHT.

This pattern is also supported and used throughout the whole poem.

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