I'm assuming you already have your CAC. If you have a CAC reader at home, log into af.okta.mil and go to vMPF. Once in vMPF, click on career data brief (CDB). Scroll down to the 'Projected Assignment' section on the right. It should tell you there what course is loaded. Vance legacy is PV4AU.
Alternatively, call your unit's CSS and ask. With a UPT start of September as a civilian hire, you are likely going through the legacy syllabus. There's no way they could fit you in OTS, IPT, and then UPT in the span of 4 months.