Yes, you are a provisional taxpayer.
Why
Because you earn income from a business, trade or profession that doesn't have PAYE deducted, you fall within the definition of a provisional taxpayer in paragraph 1 of the Fourth Schedule. The R30 000 and tax-threshold exclusions only apply to people with no business income, so they don't help here.
What to do next
You are liable to request and submit an IRP6 provisional tax return for the first period (by 31 August) and the second period (by the last day of February), and you may make an optional third (top-up) payment by end of September. There is no separate 'register as a provisional taxpayer' step anymore. The onus is on you to request the IRP6 on eFiling and pay on time to avoid penalties and interest.