how do I determine the status of a process within a terminal tab?

The ":ls" command in Vim output the current buffers in Vim. If one of the buffers is a terminal, there are some useful flags to examine there. For example, if the command was

:term echo "test"

:ls will contain an entry similar to:

 7 %aF "!echo "test" [finished]" line 1

Question: is there a vimscript function that could return such extended information about a buffer? :help terminal suggests that if modifiable option is off, the job had to have finished. Namely,

before changes can be made to a terminal buffer, the 'modifiable' option must be set. This is only possible when the job has finished:

So, is examining the modifiable option the best way to determine if a shell process has finished? What if I wanted to examine the exis status?

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