Google Pixel 4a
USB Power Delivery 2.0
No, Google Pixel 4a does not offer any kind of IP rating and it is not waterproofed.
Google announced 3 major Android updates. So it will receive Android 11, Android 12, and last update will be Android 13.
Google announced 3 years of security updates for Google Pixel 4a, so it will receive patches approximately until 2023.
No, Google Pixel 4a doesn't have Wi-Fi 6 version or newer.