I have had several independent shops that wouldn't align an X5. I have mine aligned by the dealer and request a color version of the before and after sheet to have a history.

It will make a difference (very little) in alignment between new and worn tires. I would wait, no reason to do it now.

FYI-Aligning your X outside of BMW specs will change the handling. Less negative camber will reduce the turning grip and turning response but that doesn't matter to many.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas