How do I determine the RHEL version by looking at this extraction, I can only know that it is RHEL7 from el7 but what is the exact version?

Command: /bin/uname -a
Linux xxxxxxxxx 3.10.0-957.12.2.el7.x86_64 #1 SMP Fri Apr 19 21:09:07 
UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

In the Fedora/RHEL/CentOS family, you can use:

cat /etc/*-release

That will give you the exact version.

As root, you can also install redhat-lsb-core and use:

lsb_release -a

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