The indicator of mass adoption is, for example, the announcement of the owner of airbnb about the beginning of the adoption of cryptocurrencies as payment for rent, and this is not particularly significant news, but still has a positive effect on the crypto market as a whole.
These is good that adoption is really happening, there are many ways to use it now and to get access of it, however at these time that price of BTC is rising and is too volatile. I will intend to just invest my money or keep it still as crypto investment than using it, when the price seems too be much more stable in the future and adoption becomes more bigger many industries will use and implement it like a fiat that's the only time to spend it.