<form method="post" accept-charset="UTF-8">
  {{ csrfInput() }}
  <input type="hidden" name="action" value="entries/save-entry">
  <input type="hidden" name="entryId" value="{{ proposal.id }}">
  <input type="hidden" name="enabled" value="1">
  <input type="hidden" name="redirect" value="{{ craft.app.request.absoluteUrl|hash }}">
  <input type="hidden" name="field[proposalStatus][]" value="delivered">
  <input type="submit" value="Publish">
</form>