Yes the Tour is going ahead but if any team has two positive cases (in a 7 day period) they will be kicked out, and that doesn't just mean riders, but team staff as well so physios, managers, coaches, etc.
https://www.sbs.com.au/cyclingcentral/article/2020/08/24/two-positives-and-youre-out-teams-unhappy-tour-covid-19-protocols

