The IRS won’t open Efiling until in January. Probably late January. Or you asking about the Online version? Online won’t open for a week or two, keep checking back. You can buy and install the Desktop program now.
You can buy the Desktop Download program at
TurboTax® Desktop 2023-2024 | Tax Software Download
2024 Desktop System Requirements
The IRS normally will start accepting tax returns for the 2024 tax year in late January 2025.
Usually the tax return can be e-filed by mid-January of 2025. However, the e-filed return will be just sitting on the TurboTax server until the IRS actually starts accepting tax returns.