The Microsoft Teams desktop app is coming to existing installs of Office 365 ProPlus and Microsoft/Office 365 Business/Business Premium.
Starting on July 9, 2019, Click-to-Run will install the Teams client for all PCs on the monthly channel, and the client will update itself regularly from that point onward. This will be a gradual rollout over several weeks, so not all existing installations will immediately get Teams added when Office is updated.
Read the announcement here:
- BLOG: Teams is coming to Office 365 Business & Office 365 ProPlus monthly
https://techcommunity.microsoft.com/t5/Microsoft-365-Blog/Teams-is-coming-to-Office-365-Business-amp-Office-365-ProPlus/ba-p/725481