Yes, that is correct. Remember to file form 8606 when you file your taxes.
I use Vanguard for my IRA. After the funds settle in the tIRA, an option to "convert to Roth" pops up, so the process is incredibly easy. If you don't invest until it's converted, and convert within a couple days of the contribution, the taxable earnings will be limited to a few cents, and those round off when you file.
https://www.physicianonfire.com/backdoor/There are also a few step-by-step sources for filling out form 8606 with various software, if you do your own taxes.
ETA: I'm assuming you have no existing pre-tax/tax-deducted tIRA funds. If you do, you'll need to deal with those (pro-rata rule). Easiest way to do that is to roll those funds into your 401k before 12/31. You could convert those funds fully as well, but the taxes may hurt.