How quickly do you see results after updating product titles?
How important are the product_detail and product_highlight attributes, and when do they start to appear?
Hello Digital Spinach, thank you for your question, and my name is Emmanuel your host for todays AMA.
You should see improvements within a week, here is a case study I did for when I improved data in Google Merchant Center, and how quickly it resulted in improved results: https://www.youtube.com/watch?v=pqFCRer5K4Y
Back when product highlights were just launched, Google gave us info that this attribute alone would give you 20% more ranking, this was stipulated in the documentaiton. So it’s a very important attribute. However nowadays such info is no longer shared by Google. But I would not just focus on product details and product highlights, I would honestly implement all applicable attributes, have a look at the whole list here: https://support.google.com/merchants/answer/7052112