If you can figure this out as a feature, I'd like it too. Today, I manually type in the delivery times for each product in the description section. I use the shipping method to assume the delivery times and adjust this if needed. So if I'm using epacket, I put 10-15 days, if China Post or Aliexpress Standard, I use their estimated delivery time (15-40 days etc)
Today I discovered that I need to add a statement or estimates the delivery for international addresses because my current delivery times assume a US destination.
Shipping Delivery Times: 10-15 Days