You should not file your 2021 return without all of your 2021 W-2's, it could delay the processing of your return. The IRS gets copies of all W-2's & they can stop the processing of your return until they contact you for more information. See the following:
If you’re unable to get your Form W-2 from your employer, contact the Internal Revenue
Service at 800-TAX-1040. The IRS will contact your employer or payer and request the
missing form. Let them know:
• your name, address, Social Security number and phone number;
• your employer’s name, address and phone number;
• the dates you worked for the employer; and
• an estimate of your wages and federal income tax withheld in 2016.
You can use your final pay stub to figure these amounts.
If, after contacting the IRS, you still do not have your Form W-2, you have two choices:
1. File your return by the April due date and use Form 4852, Substitute for
Form W-2, Wage and Tax Statement. Try to estimate your wages and
withholding as best you can.
2. Ask for more time to file by using Form 4868, Application for Automatic Extension
of Time to File U.S Individual Income Tax Return. You can even e-file the
request.
If it turns out the information on the Form W-2 is different than you reported, you will
need to file an amended tax return using Form 1040X, Amended U.S. Individual Income
Tax Return, to make the change.
You can visit the forms and publications web page on IRS.gov to view, download or
print the tax forms you need right away
What To Do If You Haven't Received a W-2
https://turbotax.intuit.com/tax-tips/irs-tax-forms/what-to-do-if-you-havent-received-a-w-2/L1Jg4rlHB
