Funding for the second daily train is in the transportation omnibus in Minnesota. From Minnesota House Session Daily, 6/22/2021:
This particular bill is likely to pass - listening into the session there was an attempt to remove the funding but that amendment failed. I believe this is one of the last funding pieces needed to get the second daily train out of study mode and into implementation mode.
One-time General Fund appropriations for MnDOT include:
[...]
$10 million for second daily Amtrak service between Minneapolis/St. Paul and Chicago;
This particular bill is likely to pass - listening into the session there was an attempt to remove the funding but that amendment failed. I believe this is one of the last funding pieces needed to get the second daily train out of study mode and into implementation mode.