French · Pronunciation Guide
tar — one syllable, an open "ah", a throat "r", and a silent "d".
One syllable. The related noun phrase "en retard" has the same ending and means being late for something specific, while "tard" alone is about the hour of the day.
Listen: tard
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Il est trop tard.
It's too late.
Listen: Il est trop tard.
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"Il est trop tard" links the pronoun into the verb, /i.l‿ɛ/, and there is no liaison after "trop" because "tard" starts with a consonant. The sentence is only three syllables and ends on the throat "r", where the pitch peaks: ee-LEH-tro-TAR.
English "tar" gives the right vowel but ruins it with an American "r" that swallows the "ah" entirely. Form the vowel first, cleanly, then add the throat rasp. The bigger trap is meaning: "je suis tard" is not French. To say you are late you need "je suis en retard" — "tard" describes the hour, not a person's punctuality.