If one of the 24 elders was used to convey that important truth, he would have had to be resurrected to heaven by 1935 at the latest. That would indicate that the first resurrection began sometime between 1914 and 1935.
As I already said, the first resurrection takes place on the 'last day'. That 'last day' is when Jesus comes after the GT. When Jesus comes it is the end of Satan's rule/kingdom and the beginning/start of God's kingdom rule.
Unless the WTS is willing to say the 1,000-yearlong 'last day' has already started (which they do not), then it is BS for them to claim the 'first resurrection' has already started (which they do claim that) even though they know it has not started.
[1-15- 14 WT – IN THE spring of the year 31 on a mountain close to the town of Capernaum, Jesus Christ taught his followers to pray: “Let your Kingdom come.” (Matthew 6:10) Today, many doubt if the Kingdom will ever come. However, we are confident that Jehovah will answer our prayers for his Kingdom to come.]
There in 2014 they show that they are still waiting for God's kingdom to come.
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[2 Timothy 4:1 I solemnly charge you before God and Christ Jesus, who is destined to judge the living and the dead, and by his manifestation and his kingdom,8 From this time on there is reserved for me the crown of righteousness, which the Lord, the righteous judge, will give me as a reward in that day, yet not only to me, but also to all those who have loved his manifestation.]
[5-1-90 WT p.26 par.9 – Martha knew about that hope from her association with Jesus, for she had previously said to him regarding Lazarus: “I know he will rise in the resurrection on the last day.” (John 11:24) She knew that the resurrection would be, not on his (Lazarus’) last day, but in the future, “on the last day”—Judgment Day, when the dead would be raised under God’s Kingdom rule.]
[12-1-89 WT p.9 – The judgment will take place “in the last day,” during Christ’s Thousand Year Reign.]
[7-1-98 WT p.21 par.12 – That “last day” coincides with the Thousand Year Reign of Christ. (Revelation 20:6) Imagine the excitement during that “day” when this grand event begins!]
[ 39 This is the will of him who sent me, that I should lose none out of all those whom he has given me, but that I should resurrect them on the last day. 40 For this is the will of my Father, that everyone who recognizes the Son and exercises faith in him should have everlasting life, and I will resurrect him on the last day.”]
[11-15-55 WT -. …Satan’s kingdom ends completely at Armageddon.]
[9-1-91 WT – Almighty God has set a time limit to Satan’s activity among mankind. When that time limit arrives, destruction will come upon the world lying in Satan’s power.]
[Revelation 11:15 And the seventh angel blew his trumpet. And loud voices occurred in heaven, saying: “The kingdom of the world (Satan’s) has become the kingdom of our Lord (JEHOVAH) and of his Christ (JESUS)”]