I think so but they are white.
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Leaves look like a lilac.
But....
They flower in spring/May and that tree is definitely big enough to flower if it was a true Lilac.
For Tree Identification the book: Trees in Canada by John Laird Farrar is a really excellent and easy to use resource.
Definitely a lilac, they come in different shades of pink/purple and white.
I have 2 lilacs and they have both already blossomed out weeks ago. Also the trunk on your tree looks nothing like mine. Mine have many branches shooting out from ground level. They are basically as wide as they are high. Kills the grass from lack of sun and rain. Yours doesn't seem to have that? Also the blooms are extremely aromatic.
Looks like a lilac like everyone else has said
Thanks for all the help... it is a lilac...blooms with white flowers in late spring... Green leaves throughout the summer...