accept() return point vs incoming SYN

3-way handshake is (1) C->S SYN (2) C->S SYN (3) C->S ACK.

The accept syscall returns at the point when packet #3 is received on
server,
correct ? Not when packet #1 is received.

Is it same on all OSes ? Are there OS where accept
returns after packets No.1 is received by server ?

Thanks
V.M.
.

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