I sincerely hope your symptoms have resolved at this point.Completely symptom free with a negative test once all symptoms have been gone for 24 hours or more.
That guidance is outdated. CDC specifically recommends against test based strategies for RTW except in rare cases (immunocompromised), and in those cases, two negative tests are recommended.
We have good evidence that for mild to moderate cases in immunocompetent patients, no viable virus is shed after reaching both day 9 from symptom onset (we use 10 to be safe) + 1 day post improved symptoms (without antipyretics).
We know people can shed RNA targets of the PCRs after that criteria causing positive tests well after the period of contagiousness is past. We've known this for a while actually. The latest greatest read is this prepress metanalysis of 79 studies looking at viral shedding by respiratory, stool and serum. The important take home is that while patients can shed viral RNA for quite a while (as much as 89 days), the maximum viable virus has been 9 days after onset of symptoms.