You have to download your whole return with all the worksheets. It won't be your actual W2 but only the info you typed in or imported from the W2. You can't use it for proof for anyone. If you need an actual copy you need to ask your employer for another one.
How to download all forms and worksheets
How do I get a copy of a return I filed this year in TurboTax Online?
I NEED A COPY OF MY W-2 (or 1099)
TurboTax does not have a copy of your W-2—the Wage & Tax Statement—issued to you by your employer, (nor does TurboTax have copies of your 1099’s). You should always save those documents for your own records. You could ask the employer(s) for copies or you can get a copy from Social Security (for a fee of $126).
To get a copy of a W-2 from Social Security https://faq.ssa.gov/en-us/Topic/article/KA-02501
If you saved a pdf of your completed tax return, the worksheets will show the W-2 information you entered, but not the actual W-2.
You can get a wage and income transcript from the IRS: It will not show the actual W-2, 1099’s, etc, but will show the income information the IRS received. It will not, however, show your state information. It will only show the federal information.
https://www.irs.gov/individuals/get-transcript
Or you can pay the IRS $43 for an actual copy of your tax return which will include copies of your W-2’s
https://www.irs.gov/pub/irs-pdf/f4506.pdf
https://ttlc.intuit.com/questions/2561916-how-can-i-get-a-copy-of-my-w-2