Checking out your link, solscan still doesn't show the picture correctly, so I think it's unlikely that the problem is it taking that long to populate. Moreso, it seems Solscan is parsing it incorrectly, as can be seen by this screenshot. You can get to this page by clicking "View URI Metadata" on the "Metadata" page of your token.
For comparison, I found this other token here (NFA) that uses arweave for its token metadata as well. It's metada looks a lot more normal:
Looking at the arweave source, it looks mostly the same as yours, however there are a few differences, most notably it has an indent for each field of its metadata, which you do not. I'd assume this is the problem, but if it's not, I'm sure with this other token as a comparison and the "View URI Metadata" button it should now be easy for you to figure out what the root problem is with a little bit of trial and error :)