You could ask the current tenants to do a video tour and record that. 

You may consider advertising it 1-2 weeks early with a COMING SOON header and clear instructions that it's not available for in-person showings until after a certain date.

If she inherited it she got a stepped of basis at date of death- she could potentially owe close to no taxes on the house sale depending on when it was inherited. 

Our plan is to pay the arras with the clause that you mention and put the following dates: contingent on approval of the mortgage by 1st Aug, exchange on 1st Sept or something like that. 

Sometimes interest rates don't change nor maturity dates.

Accordingly, at the Tenant’s sole cost, risk, and expense, the Tenant herewith agrees to be responsible for replacement of the air filter (or, cleaning if the filter is a “reusable” or “washable” type of air filter) not less than every six months from the commencement date of the tenancy.

Thanks @Marlen WeberI currently have a few commercial deals that my buyers are pushing sale dates on and asking for discounts.

And all but three rent payments are in (the three remaining were grandfathered in with a due date of the 5th and I'm confident all will pay as none reached out to me about payment hardship). 

Of the four, three have until the 5th to pay (grandfathered in on old due dates).

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