Brand new iPhone XR battery health is 98%

Josh ~ That number is only an estimate of a dynamic chemical process and the battery may have been manufactured months ago – so not "brand new".

iPhone Battery and Performance

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JoshInvicta wrote: "So basically even if the phone is brand new, the battery may not be?"

Correct – Apple's battery suppliers may have had the battery sitting in their warehouse for months waiting to be shipped to the iPhone XR production line.

"Is it normal?"

Probably.

"Should I be worried or just go on with using it?"

Don't be worried and just go on with using it.

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See this thread https://discussions.apple.com/thread/250340482