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Until your next turn, all lands you control become 2/2 Elemental creatures with reach, indestructible, and haste. They're still lands.
Sylvan Awakening affects only lands you control at the time it resolves. Lands you begin to control before your next turn won’t become creatures.
Sylvan Awakening doesn’t untap any of the lands that become creatures.
The lands affected by Sylvan Awakening stop being creatures as your next untap step begins, before you untap your permanents. If this causes any state-based actions to become applicable, or if any abilities trigger, those are handled during your upkeep.
