This is the 939th most frequent Dutch word.
gewerkt
"Gewekt" means "worked" (past participle of "werken").
Here, 'gewerkt' is used as the past participle form of 'werken' in the present perfect tense.
Ik heb hard gewerkt aan mijn project.
I have worked hard on my project.
In this instance, 'gewerkt' is the past participle form used in the past perfect tense.
Hij had al gewerkt voordat wij aankwamen.
He had already worked before we arrived.
'Gewerkt' functions as the past participle in an indirect speech context, combined with 'had' to indicate completed action in the past.