because of the time required from when the IRS provides the final, approved forms to the time it takes for TT to assess, program and test any changes and for the IRS to review and approve them.
If you are using TT to estimate your refund / tax due, then it is probably 'close enough'
you can't complete your tax return until you receive W-2s from your employer, etc and that won't be until January. Further, the IRS doesn't accept 2020 returns until late January in any event.
