Here's an easy way to check oil level when there's no centerstand or assistant to hold the bike balanced upright.
While sitting astride the bike, use an inexpensive pocket style telescoping mirror to see the oil level through the sight glass. Such mirrors are readily available from almost anywhere automotive tools are sold.
No precariously trying to hold the bike steady and level while squatted down and bent over or on your knees beside the bike.
Works even better with a flashlight or worklight on the floor with beam directed at the sight glass.
Good Fortune!