They are not in the MCU.
It goes by this:
- Season 1 - Season 4 Episode 22: MCU timeline, reality
- Season 5 episode 1-4; 6-10: They are taken to the future of what is likely going to happen as other parallel universes have suffered the same fate. (In the MCU you can indeed travel to the past and future). They go to the past
- Season 5 episode 11-22: MCU timeline. The team arrives, the loop is broken and due to the divergence, the MCU branches off from the Destroyed Earth reality. Imagine a twig being split in two. NO REWRITING.
- Season 6 episode 1-13: MCU Timeline. Deke says the 2091 is still intact but for the MCU is just an aborted timeline as the new 2091 will be nothing like the one they visited before.
- Season 6 episode 13, now while this is yet to be seen, Simmons, Fitz and Enoch indeed time traveled to rescue the team from the Temple of the Forgotten. Just think about it, they always talk about the amoun of time that has passed. So it is likely they spent years and years developing the JumpDriver, therefore we have 2 routes:
**ROUTE A: there is another timeloop in 2019, the team was ALWAYS meant to be saved by Simmons and Fitz so they could go back in time and ensure the events of 1931 and 1955 which are part of the MCU past (predestination paradox)
**ROUTE B: there was a branch in time in 2019 created by the arrival of Simmons and Enoch to the Temple of the Forgotten, so we have an alternate universe where the Chronicoms killed S.H.I.E.L.D. in 2019 and Simmons and Fitz saw that, and just built the time machine to save their friends and then fight off the Chronicoms to avoid their colonization of Earth. But as this is also a reality which is exactly the same as the one explained in Route A so the team should have always been saved in 2019 to go to the past and ensure the events of 1931 and 1955 (main MCU timeline). Therefore, it has to be route A.
-Season 7 episodes 1-4, it is the MCU timeline as well, however, there is a branch in time in 1955 when Luke stays behind to ensure Malick's survival, this is a wave, which causes a branch in time. And now the MCU is split into two, the MCU reality and the Malick's Project Insight reality, where the agents are currently there.
Current timeline: Malick's Project Insight reality. Will they manage to return to the MCU timeline and stay there? Time will tell.