Hey,
I have synced with the team: So due to the ever-increasing number of people signing up for Sharing invites each day, the queue has become a much longer wait than when our Sharing platform first launched!
Some more info from another post about Sharing invites:
So right now I don’t have an exact answer for when you can expect your invites, but we are doing our best to get everyone their invite in the shortest wait time possible! 
Marisa