Using the calculator, I got 28 psi for your tires but we don't have full specs for either of your tires. I assumed both were standard load tires (SL) and a Hard metric size i.e. a 245/65/17 vs a "P" metric i.e. P245/65/17.
As far as waiting to see how the tire is wearing, to make changes, do the tire chalk test. Chalk the full width of the tread and about 6" of the circumference, then drive the car straight on a smooth level surface, for about 100', with gentle acceleration and breaking, then check to see how the chalk looks. If, chalk is showing in the middle and not on the outside 1/4-1/3 of the tire, your pressure is too low. If the reverse is true, your pressure is to high.
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