Yesterday we tracked Tianwen-1 with one of the 6.1 metre dishes at Allen Telescope Array. Even at 188 million km distance the signal is strong enough to decode most of the frames. The spacecraft will arrive to Mars orbit on Wednesday at 12:00 UTC. 
The last orbit state vector we received in that observation is:
2021-02-07 23:23:03.744100 18791639.655712113 211029173.8782428 96492674.05965108 -21.108400067542537 4.768376820024702 1.8445381918644286
2021-02-07 23:23:03.744100 18791639.655712113 211029173.8782428 96492674.05965108 -21.108400067542537 4.768376820024702 1.8445381918644286
According to that state vector, the periapsis altitude is now 386 km, with passage at 11:59:52 UTC. The MOI burn will start several minutes before this, and probably lower the periapsis slightly.
This shows in yellow the period in which the 3kN engine will be burning, and the spacecraft returning to a slightly lower periapsis some 11 days later (this is just a prediction based on some papers describing the orbit planning).
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