Yes, you are correct, check 2020 Michigan Forms availability for the most recent updates.
Keep in mind the IRS will begin receiving returns February 12, 2021. The State of Michigan does require the Federal Form 1040 Adjusted Gross Income as the starting point to complete the return and although the forms for many States might be available, the actual processing of the returns will not even begin until this date.
Regarding the pension schedule itself, for your reference: 2019 MI-10140 Instructions Form 4884-Pension Schedule begins on page 51.
