You can get your 30 day extension stamped in 2 weeks before your
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date. 1900b
From the following day, you would be able to apply for the 60 day covid extension until
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@ 1900b. First given an under consideration stamp, and then you return for the full extension stamp.
NB, most Immigration offices have more paperwork requirements for the covid extension. Clarify this when you visit for your initial 30 days.
Both stamps should be extended from your expiry date, not the date you apply
Who knows for sure what will happen post
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, i.e. if further extensions will be granted due to covid.