TurboTax cannot track your 3rd stimulus or tell you when it will arrive. The IRS is issuing 3rd stimulus checks on its own timetable.
You can use the IRS Get My Payment site to see what is expected for your 3rd stimulus check:
The third stimulus and the your Recovery Rebate Credit are running on different schedules. The IRS will use 2019 info if it hasn't updated its records with 2020 info when it's time to send out your stimulus.
Check Get My Payment? for information about your third stimulus.