I looked at Vanguard's tax center to see various time frames for various tax forms. But the bottom line is that that the forms should be available in mid-February.
Vanguard 1099-B, available by mid-February
Vanguard 1099-div, available by mid-February
Vanguard 1099-int, available by mid-February
If you only have mutual funds, the forms might arrive earlier. There's other qualification that may not apply to everyone, but here I'm just capturing the latest date by which people should get their tax forms from Vanguard. Hope it helps with planning.
With a brief search for Scwhab's forms, it looks like:
Schwab all 1099, available online in mid-February (end of Feb for paper forms).
Fidelity seems to require a login to gather that information. Do any Fidelity know their date? Also mid-Feb?