Oil to the rockers can be inferred by loosening the banjo bolts a bit whilst at idle. There should be seepage. The alloy gaskets may or may not reseal.
Oil to the crank can be inferred by pulling the quill bolt and kicking over a few times with the decompressor engaged. You'll see oil flow to the quill annulus through the feed port in the casting. Be advised if you find that the quill seal comes out skewered on the quill bolt, you already know what the afternoon's maintenance task will be.
None of these need be done unless you have changed something, i.e. timing side repairs or oil/filter change. Check flow at that time & leave it alone. I prefer to pull the fuel tank, pop the rocker covers, kick over a few times and see the oil squeezing out around the rocker shafts. The crank oiling can be seen at the quill at the same time, and the quill seal condition assessed, but that tells you little to nothing about the actual condition of the con rod bearing, just that the oil pumps are functioning at some level. In my experience it takes about 40 kicks to develop enough oil in the crankcase to see the scavenge pump work, so check the rockers, then the quill. However, if the main pump didn't work, you wouldn't see oil to the scavenge pump, then rockers.
Install some 20 PSI gauges if you must, they will produce some oil pressure info on cold start-up at least.
The good news here is that your machine doesn't appear to be wet sumping, as the oil levels aren't changing perceptibly. There is a certain amount of trust necessary to enjoy your machine. Unless you see, hear or feel a change in operation, it's likely that it's OK.