I think we can say the Yggdrasil has it's own form of time that is transcendent over the 9 realms. According to Ymir's Jotnar shrine, it states that
time was young when he was created and because we know no realms were around yet that could mean the Yggdrasil has its' own overarching timeline. This is further evident by "Primordial" being used to describe the Primordial Ice and fire that met to birth Ymir since Primordial means "existing at or from the beginning of time; primeval." and we know the use of the word literally is valid because we do so for Greek God of War. Also during this time, "space" did not exist as space was only created after Odin used Ymir's skull to create it which is something to note.
This would mean Yggdrasil existed before space and time, Primordial ice and fire meeting caused time to exist and Ymir to come into existence and Odin was somehow able to create different space-time universes out of Ymir's body and it's all maintained by the Yggdrasil. The Yggdrasil has no need for concepts such as time and space as it existed before both but it can maintain the existence of several space-time universes and is stated to transcend space and time of the nine realms.
This sounds like something far beyond 2-C but I'm unsure if it qualifies for tier 1. It's kinda in-between.