A few years back while writing the CRM Mobile Survival Guide, I found that SSRS reports could not be run on mobile, even when viewing CRM via the tablet browser experience. Unless you took several extra unsupported steps such as tricking Safari into thinking it was a desktop browser.
In my tests of Dynamics 365 on mobile, I have found this to no longer be the case. If you open the Dynamics 365 app and click the “open in browser” button, the tablet browser experience now no longer hides the “Run Report” option. This means that you can now run your SSRS reports without having to jump through a bunch of unsupported steps.