Feedback needed on circuit
Yes, what you show looks like it would do what you want.  I didn't look at particulars since the text is too small to read after your latest edit.  However, the basic topology looks sound.

Some things to consider:

Make sure that the first FET is adequately turned on by the digital logic high voltage.

Make sure the two voltage dividers properly attenuate the worst case input to the valid input range of the A/D.

By "Vin" you apparently mean the supply voltage input?

Check the quiescent current of the first DC/DC converter at left.  A linear might yield lower long term average current if the micro spends most of its time sleeping.