The delivery will have arrived by next Sunday.

is this an example of future perfect tense or an example of passive voice? or both?

Never mind, It can't be passive voice since it's doesn't have "be"

Correct.

The sentence "The delivery will have arrived by next Sunday" is an example of future perfect tense. In this sentence, the verb "will have arrived" indicates an action that will be completed in the future before a specific time, which is "next Sunday".

The sentence does not involve passive voice because it does not emphasize the subject (delivery) receiving the action. In passive voice, the subject usually receives the action, and the sentence structure is typically "object + verb + past participle + by + subject" (e.g., "The delivery will be arrived by next Sunday"). In this case, the sentence is in active voice with the subject (delivery) performing the action (arriving).

To identify the future perfect tense in a sentence, look for the modal verb "will" followed by the auxiliary verb "have" and the past participle form of the main verb. This specific structure indicates an action that will be completed in the future before a specified point in time.