You can put a small TM next to your brand right now, today, having filed nothing. What you cannot do is use the R in a circle until the USPTO has actually registered your mark. That is the whole distinction, and getting it backwards can cost you.

Key takeaway: TM is a free claim anyone can make. The registered symbol is a legal statement that you hold a federal registration, and using it before you do is improper.

TM and SM, the free ones

TM says "I am claiming this as my trademark." No application, no fee, no permission. Use it on a product the moment you start using the name. SM is the same idea for a service business rather than physical goods, a consultancy or a cleaner. Both just assert the common-law rights you build by using the mark. Most people use TM for everything, which is fine in practice.

The R is different

The registered symbol means one specific thing: this mark is federally registered. You may only use it after your registration certificate issues. A pending application does not count. Using it early is not a harmless overstep, done knowingly it can be treated as deceptive and can sink an infringement case or even your application. And it only covers the goods and services your registration actually lists, nothing more.

Do you even need one?

Legally, no. Skipping the symbol does not forfeit your rights. But the registered mark earns its keep when you sue. Under federal law, a registered owner who never displayed the symbol generally cannot collect the infringer's profits or damages unless that infringer already knew about the registration. The symbol is the legal notice that unlocks the money. That is the real reason to use it.

Where it goes

Upper-right of the mark, small, as a superscript, which is the convention for all three. You do not have to stamp it on every single instance. The first or most prominent appearance on a page, a label, or an ad is plenty, and a one-line "X is a registered trademark of Y" in the footer tidies up the rest.