I'm sure it's safe to use, but keep two things in mind:
1) Toyota is not yet big on DI engines, at least not to the extent of Honda. Whether TGMO is optimized for DI engines (low Noack, etc.) is unknown.
2) TGMO has a good reputation here, but we can now see its composition from the MSDS on Mobil's website. Here's a big difference: TGMO is a classic Group III synthetic, with severely hydrotreated crude oil as a base. On the other hand, Mobil1 AFE 0w-20 is 30-40% PAO and Mobil1 EP 0w-20 is 60-70% PAO. I realize base oil isn't the whole package, but based on this I'm not sure TGMO quite deserves its status here. Compared to Mobil1 alternatives, at least.