As bean says, Tesla make cars in batches then try to match them to outstanding orders.
But they would have a rough idea of how popular each combination is so they would build eg 50% white, 20% blue, 15% grey, 10% red and 5% black.
Charts from
Australia Model Y Orders
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In a batch of 1000 cars you might be the 499th person waiting for a white and get it, or you could be the 201st person waiting for a blue and miss out.
At the end of the day it'll be a roll of the dice. Changing colours might get you the car sooner or you might miss out but you'll never know which.
Just order the car you really want and don't stress about it.