Hi Ali,
Since Schools often take weeks (or even months) to decide who to invite to their Programs, many Schools have shown some 'flexibility' in terms of when they need access to your Official Score Report (as long as the rest of your application is in on time). In your situation though, you might be applying without actually knowing what your GMAT Score is - and that's a bit different of a situation. Given how Covid-19 has upended the traditional application process this year, I suspect that most Schools would be fine with you applying under the circumstances (assuming that your Official Score from the At-home GMAT will eventually become available). That having been said, the professional way to handle this would be to reach out to each School directly, explain your situation and confirm that it is still okay to apply under these circumstances.
GMAT assassins aren't born, they're made,
Rich