I need to check my reported income on my 2020 return. I filed. But government is not excepting until 2/15

You can view/print your return by signing back in to your account.  However, you will not able to make any changes unless your return is rejected for some reason and comes back to you.

After 12 Feb, you will receive notification of your return either being accepted or rejected by the IRS. 

Once your return is processed by the IRS (you receive your refund or your payment is processed) and if you need to make changes to your return, you will need to complete an amendment. 

You would use the "Amend" function that you can find when signing back in to TurboTax after your return has been accepted by the IRS.