Our product is a subscription entertainment app-so winback is signing up again. Typical open and CTR are also helpful, but mostly interested in overall conversion rates.
The answer to this varies wildly. It is dependent upon what you're asking the customer to do, what your relationship with them is, and what barriers they need to navigate to signup again (your stated win-back goal).
I've seen success rates as high as 80% and as low as single digit.
I don't think you will find a "typical" because each brand, product, and consumer is different. All of which effect this type of conversion rate.
I would be happy to help you calculate what is typical for *you* and your product. If you're interested, drop me a note or schedule a call.
All the best,