Violating the terms of the lease is "good cause" under NJ law for an eviction so you are entitled to evict them for not allowing entry, although you can't enforce that right to remove them from the property until after the NJ moratorium ends (see next paragraph).Under the moratorium, you or your lawyer can file the eviction proceeding (and tell your tenant your going to for failure to pay rent and violating the lease terms), BUT the moratorium prevents the tenant from actually being physically removed from your property until after the moratorium is over. (2 months after COVID emergency is over).  

Can I even allow end buyers access to scout the property physically if I'm not legally allowed to market the property itself?

@Brandon Fuhrman I would not be too concerned about who is physically showing you the house because it sounds like she will be involved in every other aspect of the deal.

@Osvaldo Benavides here are some reasons you would hire a GC:1) It’s not one of your strengths to oversee a rehab 2) The GC fee works in your numbers and you are okay sacrificing some return on investment for ease 3) You are physically distant from the renovation

Furthermore, a landlord may not raise a provider’s rent in retaliation of the provider’s exercise of their legal rights.6.

On top of it, i have explained that I am not even able to get banker appointment as not all banks are allowing physical meetings due to COVID.

I wasn't physically able to see the property, but I could video chat and get a good look at my the place.

Working from home will make for a more egalitarian employment landscape as accessibility to positions becomes more widely available--specifically those who were previously unable to make get to their physical place of work, whether due to disability, lack of transport, or any number of reasons will now be able to work remotely (I especially think there will be a revolution for those seeking ADA assistance as the general excuse given by employers/HR departments is "this is not a job that can be performed remotely"--good luck getting that excuse to fly post Covid). 

No physically work just paperwork

First, here you're physically in the market which will make obtaining finance & setting up a team with a great property manager, etc much much easier.