Fruity signs of life - 2021

I'm hoping this is a Mirabelle plum! 
It flowered for the first time last year but there were no fruits, masses of blossom this year, so, fingers crossed for pollination.

Hope so! Mirabelle is the best plum in the world - not a fan of eating plums fresh but I could trough my way through a box of them! Sadly my new one bought last year looks very much like a dead stick