Pill-capsule shaped metallic object seen from plane window

My partner and I were traveling from St. John's, Newfoundland to NYC and had a brief stopover in Toronto.
During the planes decent into Toronto my partner and I both briefly noted a capsule-shaped metallic/whitish looking object through our window on the left side of the airplane.
The object appeared to move past the plane in the opposite direction than we were moving (towards the back of the plane) but may have also just been moving slow or stationary relative to us. We visualized it for about 2-3 seconds before we passed it. We were on decent and about halfway down to the runway from our cruising altitude. The object seemed just past the planes wing but it was hard to pick up details of it so I believe it was actually much farther away.
My partner and I both saw it individually, and we both turned to each other to see if the other had seen it. No one else on the plane had seemed to notice it.
We didn't report it as we assumed whatever it was would have been picked up on radar or that it may have been a drone or a bird or something. We also had a very short layover between flights and had to make our connecting flight.
There was only one object. It appeared silvery white but the sun was rising and bright so it was hard to tell. We didn't see any other details, we only saw it for a couple moments and then we passed it.
Our backgrounds:
Myself: Registered Nurse (critical care)
My partner is a dispatcher for 911