Knockakelly is in the North Riding of Tipperary. It’s in the civil parish of Glenkeen RC parish of Templederry). Note that there is also a Knocknakilly nearby in the parish of Galbooly, also in the north riding. (Spelling varied and you need to be sure you have the right one).
The easiest way to find any of these townlands on a map is probably to use Griffiths Valuation. Click on the place name search option. The GV maps allow you to overlay a modern map on the contemporaneous map, so tracing the location more easily today.
Knocknakelly is a typical Irish townland, being 376 acres and just 9 households listed in it in Griffiths (1851). So searches on Google or Googlearth, or on a conventional map of Ireland, are very unlikely to bring them up. Or they may even bring up somewhere else of the same name. It’s about 20 miles south east of Nenagh following the R498 to Thurles. It’s a few miles off, in some minor roads. (You’ll need Griffiths to find it precisely).