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round-trip time is much easier and more reliable than absolute sync, get a remote node to repeat a message back.

NTP (system time) will get you closer than raw GPS messages, usually within 10ms

If you can get identical GPS hardware at both ends and a GPS pulse-per-second (PPS) kernel driver, you can realistically get within 20uS sync between system clocks

Raspberry pi supports PPS out of the box, and a lot of cheap commercial GPS modules have at least a blinkenlight on the PPS line

Without more context, I wouldn't bother going more complex than round-trip-time

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