Hi,
Welcome the community! 
Processing is running using Java’s JVM, looks like there’s already Azul OpenJDK builds available for M1 :
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https://stackoverflow.com/questions/64788005/java-jdk-for-apple-m1-chip
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https://www.azul.com/downloads/zulu-community/?os=macos&architecture=arm-64-bit&package=jdk
I also link this previous thread : Big Sur and new Macs