It hasn't been updated lately because there is nothing to update. I'm not the person managing this spreadsheet.
https://docs.google.com/spreadsheets/d/15hiSOTm85W1CG6c0jzQ8B7lXLo1JEwsWKr3zIszC2Zg/edit#gid=750263404
There has been cases of people being denied their green card because they came to the US on a tourist visa with the sole intention of getting married to a US citizen. So I'd be very careful with it. Maybe you're better off having your fiance over for a month or so and then you can apply for the K1, or you guys can get married in Japan and then do the CR1
I found an app on github that I can run on a regular PC but it needs to be compiled. I think I just managed to figure out how to do so. I haven't tested it because I'm cooking lunch right now but here is the app. Just rename the .txt to .rar before attempting to open it.
Here is the link to the github app https://github.com/gentlespoon/USCIS-Case-Status-Checker
dist.rar.txt
I-129 F Sent - August 18th 2021
I-129 F Received - August 20th, 2021
I-129 F - Notice Date - August 23, 2021
126000 group
I wanted to file in February but my fiancée made me wait until August. I keep telling myself not to cry over spilled milk.