Both words are correct in the Portuguese language. Both are forms of the participle of the verb “deliver”, which is an abundant verb. delivered is the regular participle and delivered is an irregular participle.
Delivering refers to the act of giving, returning and returning something. Also, it can refer to revealing or disclosing some information.
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Abundant verbs are those that have two similar forms in the participle, that is, the same participle in the regular form and the other irregular. In the case of “deliver”, “delivered” is in the regular form and “delivered” in the irregular form.
The word in a regular form can be used preferably in the active voice of the auxiliary verbs “ter” or “haver”. Already the irregular form, in the passive voice of the auxiliary verbs “ser” or “estar”.
