While it's reported denim update rolled out for Lumia 1020, I can't find it from update page. It shows phone up to date even after searching for update. I'm on windows 8.1 developers preview. Please help.
The 1020 was not supposed to get a new firmware version, only the new OS version as part of Denim. Since you already have that via PfD, there's nothing new for the phone.
You have something new to get even if you are on PFD for Lumia 1020 Indian CV.
OS Version for L1020 in PFD is 14219
While in India L1020 is given a different OS Version with Denim Update.
OS Version is bumped to 14234 with Denim in India for L1020.
So definitely you will get an update.
If you didn't get the update try this.
Goto Preview for Developers App.
Uncheck the "Enable Preview for Developers"
Restart the Phone.
Check for Updates.
Definitely you will get an update now if your 1020 is an Indian CV