You don’t just start trusting each other.
It’s not something that happens on the first, second, thirtieth, or seven thousandth day.
It just happens.
It happens when the team has put in the daily bits to make it happen.
It happens when the team has put in the effort to get there.
It happens when the team has committed to the result, irrespective of the costs.
Don’t force it, guide it, support it, then it will happen.