is there an update for me to go from the 32 bit to the 64 bit app

That would depend on the vendor of the application. The vendor has to actually compile the app for 64-bits and release a new version.

Many vendors have done this, but some have abandoned their product.

You could look at something like Go64 from St Clair Software which will identify your 32-bit apps and give you the URL for the vendor's website.

Or MacUpdater https://www.corecode.io/macupdater/

which keeps track of new software versions.

Your Mac CPU has been 64-bit for over ten years, and it is the specific third-party software vendor that determines if they will provide a 64-bit version of their software, or stop at 32-bit software.

Check the developer's website or the Mac App Store.

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Which App?

Yes.