Well, you're covering a lot of territory by saying "Apple iPhone", but in general what you'll see is the health information from the old battery. There are tools available that can reprogram the battery information such as the QianLi iCopy or the JC V1SE. Those are the two most popular, but you'll spend a bit for them; there are other devices as cheap as $35 USD available as well.
Note that this only helps you up until the iPhone 11. That's the point at which they changed the way the battery health and cycle count is stored, and those programmers won't work directly on the battery any longer. You end up having to get something called a tag-on flex that plugs in between the phone and the battery and is permanently installed in the phone. That device allows you to access the health information the way you used to and lets the programming device work again, although I have noted that there are now tag-on flex cables available that come preprogrammed to 100% health and zero cycle counts.
You should also note that for every phone after the iPhone XS & XR, you have to keep the original BMS or you'll get the "genuine parts" warning regarding the battery and will lose the ability to view the battery health information. So if you're going into the business of replacing iPhone batteries, get used to swapping out the BMS for all of the newer models.
Oh, and finally, you may want to seriously consider getting a spot welder; heat is the mortal enemy of lithium batteries and the spot welder generates far less heat than a soldering iron.
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