Some describing words (adjectives) look like a past participle of a verb.
Examples: annoyed, excited, thrilled
These are called participial adjectives.
Q: How do you know whether the word is being used as an adjective or as a verb?
A: If you can use the word “very” in front of it, it is an adjective.
She was (very) annoyed. (Adjective)
He had annoyed her constantly for weeks. (Verb)
Which brings us to today’s sentence in question:
We may have to wait until these technologies are matured.
Mature can be either an adjective or a verb:
She is very mature for her age.
These trees will reach 30 ft when they mature.
Matured is not a participial adjective.
You wouldn’t say: “She is very matured for her age.”
Mature is the correct adjective.
Q: So how would we correct the sentence in question?
A1: We may have to wait until these technologies are mature. (Adjective)
A2: We may have to wait until these technologies have matured. (Past Participle Verb)