You don't, until you have a copy.
IF they are being mailed out, it could be later this week.
If not then, then log into that account and see if they provide PDF file copies to download and print yourself.
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Most of my accounts are now set to download only, so no mail to wait for, and I just get them myself form my account.
It depends on the type of 1099 you are waiting to receive. There are several types (1099-R, 1099-G, 1099-NEC and 1099-MISC are some of them). If you received income that would be reported on a 1099-Nec or 1099-MISC, you may not receive the form if your income was less than $600 but you're still required to report the income.
Refer to the TurboTax help article If I didn't get a 1099-NEC or 1099-MISC, do I still need to report the income if it's less than $600? for instructions to enter your income.
If you didn't receive any other type of 1099, contact the issuer to get a replacement. If you're unable to retrieve your 1099 from the issuer, you can contact the IRS for assistance at 1-800-829-1040. The IRS can help you with trying to obtain your 1099.