TCP still doesn't solve timing of packets not matching the timing of the inputs because of jitter, retransmission, and other overheads. You would still have to rely on user client reported timestamps to tell how far apart actions are taking place.
Seems like a non issue to me, time is just relative. Analysis on receipt is still possible, because you can calculate latency.
I'd recommend checking out Leslie Lamport's work, you can probably derive some ideas. I'm not be prescriptive here because this isn't a space I plan to work in to solve problems since it's just games. Entertainment isn't really my thing, I tend to lean heavily into systems and security knowledge which has served me well broadly.
