https://wccftech.com/2020-iphone-se-supports-18w-fast-charging-but-ships-with-5w-wall-adapter/

Yes, that's right. The new 2020 iPhone SE features 18W fast charging over USB-C to Lightning but ships with that measly 5W wall adapter.

Apple added support for 18W fast charging with the release of iPhone 8 and iPhone X. The trend continues with the iPhone SE and you can fast charge the phone from zero to 50% in just 30 minutes. But there is a small catch as usual. See, the iPhone SE ships with a 5W adapter in the retail box. So if you want to get in on the fast charging bandwagon, you have to purchase a USB-C to Lightning cable and an 18W USB-C adapter from Apple, or any third-party as long as it's MFi-certified.