How to query/monitor index fragmentation?
Since you are using Ola's script - he has provided a script to check Index Fragmentation - see FAQ

In addition, fragmentation on very small tables does not affect performance. Microsoft has a white paper about this:
“Generally, you should not be concerned with fragmentation levels of indexes with less than 1,000 pages. In the tests, indexes containing more than 10,000 pages realized performance gains, with the biggest gains on indexes with significantly more pages (greater than 50,000 pages).”
By default, IndexOptimize does not reorganize or rebuild indexes with less than 1000 pages. If you want to change this setting, you can use the @MinNumberOfPages parameter.