Collect everyone's flight numbers and arrival times in one shared view, then agree the rule before anyone flies: whether early arrivals wait or go ahead. Deciding it in advance is what stops a two-hour negotiation at baggage claim.
Flight details pasted into a group chat are effectively lost. You need every flight number, arrival time and terminal in one place you can look at as a whole — that's what makes the pattern of the day visible.
The schedule from three weeks ago isn't the schedule on the day. Live flight status for the whole group is the difference between adjusting the plan and finding out at the airport.