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Update:
as of 26.07.2023 around 17:00 BG3 installed successfully!
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Zulmas: Update:
as of 26.07.2023 around 17:00 BG3 installed successfully!
Installed successfully for me about 10 minutes ago :)
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Zulmas: Update:
as of 26.07.2023 around 17:00 BG3 installed successfully!
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SHartin70: Installed successfully for me about 10 minutes ago :)
Great!

But I think you'll need to re-install it tomorrow to get the full release version. I haven't heard of any preloading happening.
As Warkyria mentioned I had the same problem. I just paused the download (in Heroic Games Launcher) and resumed.
It checked first the files and then just downloaded the rest.