If this was a live tree when you cut it I believe it will be several years before it will dry if left only to air dry (which is the best way)!
If you can cut your blanks and stack them up near a tin roof they will dry a lot faster.
The tin roof will concentrate the heat.
Make sure you use narrow strips of wood to separate the blanks so air can get all around them.
Even with doing this I believe it will still take at least three years to dry at that thickness.
Like said, do seal the ends to avoid cracking.
If the tree was twisted or had some bends in it you may well get some grain.
If it was straight don't be disappointed if there isn't much.
After you cut the blanks, apply a little water to it to bring out the color and any grain that may be there.
It will give you an idea what it may look like after it is finished.
Good luck.
LONGTOM