When will older photos from Google Plus start uploading to Google Drive?

Question

Google Plus

Google Drive has recently added an additional Google Photos service. The company said that it will soon turn off
auto-download in Google+, and this service will be only in Google drive.

In my disk, I connected this service. Photos began to be uploaded from the moment the service was connected. After a while there was a record like this (screenshot below).

Has anyone come across information about when already early photos will be uploaded to Google Drive?
I rummaged and rummaged, but I did not find out anything.

Answer 1

- Well, she asked "will you fix it soon?" I say soon.
- And why soon? What if not soon?
What else men are talking about, 2011.
The problem is that Google itself cannot yet calculate how long it will take, since this will be done not as a main operation, but as a background one, so as not to overload the servers. In addition, Google does not know what the load will be in a given period, how many users decide to use this feature.
For comparison, the wipe of the downloaded library (15 thousand tracks) of Google Play Music took Google several hours.