Yes, the iPhone 14 Plus, iPhone 14 Pro Max, iPhone 14 Pro and the iPhone 14 is Water Resistant IP68 Rating and fully dust proof, not absolutely Waterproof! Which means can handle being underwater waterproof survive 6 meters depth for 30 minutes.
According to Apple Official - iPhone 14 Pro Max, iPhone 14, iPhone 14 Pro ,iPhone 14 Plus Waterproof Rating IP68 Tested Under IEC standard 60529 controlled laboratory conditions.
Why iPhone 14 Plus Waterproof test passed,it just water resistant?
For Apple iPhone 14 Plus Waterproof built inbreathable fabric membrane (ePTFE), simple & not durable waterproof design and easy damage! The iPhone 14 Plus Waterproof Only can be used for a short period time! so it's water resistant!
Splash, water, and dust resistance are not permanent conditions and resistance might decrease as a result of normal wear.
There is no any way to check how much iPhone 14 Plus water resistance left!
Liquid damage is not covered under warranty, but you might have rights under consumer law.
Is iPhone 14 Plus Waterproof? Is The Regular iPhone 14 Plus Waterproof
If you Want your iPhone 14 Plus Become Really Waterproof, Recommend using an iPhone 13 Waterproof Case