gmail scheduled messages

[prowess-alarm-much@duck.com]

Hi all,

When using gmail, for a while now, it is possible to schedule messages.
My reasoning is that these messages exist in a limbo, and when I search
them using notmuch search -- subject:"<scheduled message subject>" I
will get its thread: and a funny "the future" followed by the usual
[1/1(1)] etc.

Is there a way to search for these specific messages dynamically?

An example extracting the first two lines from a scheduled email:

MIME-Version: 1.0
Date: Sun, 1 Dec 2030 07:00:00 +0000

will this trip a query like:

notmuch search -- date:$today..$end_of_times?

assuming from a bash script:
today=$(date +%Y%m%d%H%M%S)
end_of_times=$(date -d "$today + 10 years"

Thanks in advance,