You will receive a W-2 from each employer by the end of January 2021. Enter all W-2's separately. The tax withheld from each will be accounted for.
and.....ALL of your W-2's must be entered on the SAME tax return. After the first one has been entered, you will be able to click "Add W-2" to enter another W-2 from another employer. Do not e-file until ALL of your 2020 income is entered.