Status remains Ready (auto).

Yes, this will not change. Your feeds will generate according to the schedule you have set. IN the column “products” you will see how many products there are in the feed.

How can I make it active?

You are already active.
It is set to Ready (Auto) so it will auto-update using the schedule you have set in the feed editor.

If you have set up the feed in your Google Merchant center you are up and running

https://support.google.com/merchants/answer/1219255

I finally understand. Thank you very much.