timely vs well-timed

timely and well-timed both are adjectives.

Word	Noun	Adjective	Verb	Adverb
timely	No	Yes	No	Yes
well-timed	No	Yes	No	Yes

As adjectives, timely and well-timed are synonyms defined as:

timely and well-timed: done or happening at the appropriate or proper time

Other synonyms of timely include seasonable, well timed.

As adverbs, timely and well-timed are synonyms defined as:

Other synonyms of timely include apropos, seasonably.

timely (adjective)	well-timed (adjective)
done or happening at the appropriate or proper time	done or happening at the appropriate or proper time
before a time limit expires

timely (adverb)	well-timed (adverb)
at an opportune time	at an opportune time