You can roll the dice if you want to stick with Office 2011 and just go ahead and upgrade, but be prepared to invest in an Office upgrade if it doesn’t work well.
Update: Since macOS High Sierra has come out many people are reporting that it works fine, but others are reporting that it is a little glitchy sometimes. Next month Microsoft is stopping all development on the older version of Office, which means no more security updates for Office 2011 either.
Please don’t use this as a reason to not upgrade to High Sierra. Just visit your account to download it. If you use Microsoft Office only occasionally or if you don’t often collaborate with other Office users now would be a good time to check out some free alternatives. If you subscribe to Office 365 you should be entitled to the latest version. This means that if you do depend on Microsoft Office you should upgrade to Office 2016, which starts at a one-time payment of $149.99 or $6.99/month for their monthly plan before you upgrade to High Sierra. However, Microsoft is ending support for Office 2011 in October and as such is not updating it for compatibility with High Sierra.
This is largely a refinement update, with lots of exciting new technologies under the hood that should help your computer run more reliably and more securely. Later this month Apple is releasing a free upgrade for their Macintosh operating system, macOS 10.13 High Sierra.
