Duran asked "So, if you believe the resurrection has already occurred, then does that mean that you believe the 'last day' has come and the 'last trumpet' has blown?"
The first resurrection of the anointed who have died as already occurred.
What Martha mentioned about rising in the last days or actually being raised in the last days, was the resurrection to the earth. Her knowledge and understand was limited and vague, considering that the Sadducees were some of the teachers.
Paul's understanding was also limited because he was piecing things together too.
Stop relying on what people in the Bible said or wrote and understand the mechanics of the process itself.
It's simple. When Jesus became king, he resurrected the anointed who are already dead. Then during his time in the kingdom, as the anointed died they were instantly raised to heaven.
Then at the time of Rev 20:13 the resurrection to life on earth will begin and continue over the 1000 years and then what people will do matters.