Tawnos's Tinkering doesn't grant haste, so if a noncreature permanent that entered the battlefield since the beginning of your upkeep becomes a creature this way, it can't attack until your next turn. Any activated abilities that it has with a symbol in their cost also can't be activated until your next upkeep step. Notably, this means a land that entered the battlefield after your last upkeep can't be tapped for mana if it becomes a creature this way.