Where can I find all the system images that are available in the SFSymbols? for example in the SwiftUI Image
initializer Image(systemName:)
?
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Apple has a dedicated App for this called SF Symbol. You should download the latest version from here to browse the full set of symbols.
You should always stay with the app to have new symbols available for preview, export and enjoy.
If you need to use new symbols like the new multi-color ones that introduced in SF Symbols 2.0 for iOS 14 and above, you can export them using the app itself and import them as assets in the project. Step 1 and 2 of this answer shows how you can export symbols to use it for older iOS versions