You don't need the repo "deb-src
http://http.kali.org/kali kali-rolling main contrib non-free" if you not compiling the tools from the source, so, remove it.
Start to use this commando to update:
apt update ; apt full-upgrade -y ; apt autoremove -y
The current kernel (07/19/2017) is: 4.9.0-kali4-amd64 #1 SMP Debian 4.9.30-2kali1 (2017-06-22) x86_64 GNU/Linux
Also, you always can run this script to check if you kali is up to date:
https://github.com/crashbrz/kalihealthcheck/
****Dot not use the deep checking, is not very well yet****