Ever.It is totally canon,they both like each other-heck,they addmitted it to each other!!!It's totally canon.
It's not officially canon yet though due to Ruby "forgetting" and the lack of signs they were actually together (though Ruby sooo got Jealous and Protective when Palace Maven Spenser got a little too close to Sapphire!) during the Emerald Arc. D:
I wish Ruby would just be a man and ASK HER OUT! D: