Follow to join for son?

[pryme57]

Hello all,

I petitioned my wife and my son on a single I-130 (son as a dependent) when I was a Permanent Resident and I am now a US Citizen. After I became a US Citizen, I received a letter from the USCIS stating I needed to submit a separate I-130 for my son, which I did. My wife's I-130 has since been approved, do I still need to wait for my sons I-130 to be approved or does he receive follow-to-join benefits?

Thanks in advance!