iPhone XS, XS Max, and XR come with Apple A12 Bionic chip. Apple's A12 Bionic chip, which is based on the 7nm process and it features a six-core fusion architecture with two performance cores and four efficiency cores. It's 50 percent faster and more efficient than last year's iPhone X.
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According to Jailbreak expert, it’s hard to Jailbreak A12 chip. Because A12 bionic chip comes with ARM version 8.3s pointer authentication. It removes a lot of exploit vectors & makes exploitation harder. According to iOS developer Coolstar A12, it will not be possible to jailbreak without burning any 0days or private techniques.
