You can get the last file in one go.
$last= (sort { -M $b <=> -M $a } <*.log>)[-1];
If you have a very large number of files, you may consider using
the Schwartzian Transform to minimize sorting time.
$last = (
map { $_->[0] }
sort { $b->[1] <=> $a->[1] }
map { [ $_, -M $_ ] }
<*.log>
)[-1];
Both versions are short enough to be used in a one-liner.
Update
Tested in Linux and Windows. Works fine.
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