It's a chicken and egg problem. No one has really bothered to put graphene into a mass manufactured product because of supply issues and no one's got the resources to accelerate work on the supply issue because there's no demand. Actually using high quality graphene to e.g. improve the performance of a capacitor or a battery cathode/anode by a few percent is really easy once you are sure that any money invested in doing it at scale won't go to waste because of supply issues.

Aluminum when through the same exact process in the 1800s so it's a natural consequence of the intersection of economics and science. I've got an old Scientific American from right after the Civil War with pages of people talking about this new wonder material aluminum and how it will change the world of metallurgy forever (and how useless the "machine guns" were during the war and the repeated discovery of heat treating asphalt and a bunch of other cool stuff). It wasn't until the Bayer and Hall–Héroult processes were invented in 1886-8 that aluminum became cheap enough to use in every day things. It took something like 60 years from first pure piece of aluminum for mass manufacturing to become practical but only 30 years before it changed the face of transportation and war.