Is now March too late to contribute for 2023 traditional ira and do the back door before I file my income tax on 4/15/24 and how to enter the backdoor ?

I want to contribute $6500 (after tax money) to 2023 IRA then do the backdoor right after i contribute. Do I need and  Will I get a 1099-R to file the tax 2023?

How to enter the back door since all the contribution is done between January and 4/15/24? Turbo keep saying that all $6500 is fully taxable. 

Thanks