I believe what the gp is really saying is that by the time they get to pick up the iPhone 14 Pro (whether in store or when their pre-order gets delivered), they'll be too close to the date of their departure.

In other words, they would not have had any meaningful time getting accustomed to iOS from Android, which is why they used the strategy of getting an iPhone 13 spend 2 weeks or more with it, in the hopes that if they like the experience, they'd return it for the newer iPhone 14 Pro.