tracing latency with wireshark

Run you capture, run your test

Open the capture, click on a packet.

right click on TCP in the bottom pane
-> protocol preferences -> calculate conversation timestamps

timestamps appears under TCP
right click -> Apply as column

sort highest number on top. Value is in seconds 1.0 is one second
0.02 is 2 ms.

FIN ACKs can be ignored as they are just closing connections