December

• Xperia 1
• Xperia 5

"Early 2020 onwards"

• Xperia 10
• Xperia 10 Plus
• Xperia XZ2
• Xperia XZ2 Compact
• Xperia XZ2 Premium
• Xperia XZ3

Note that Sony makes it clear that updates may also vary by details like market and network operator, so there could be some exceptions and variants to this list that don't make the cut.

It's nice to see more devices expected to pick up Android 10, but it's unfortunate to see some older devices hit the dust. The XZ1 series seems to be left out in the cold after seeing just one major update to Android 9 Pie. While it's still nice that Sony isn't the slowest manufacturer to update its phones, it could do better.

Source: Sony