It’s been six weeks I passed exam n400I changed my name my first name & surname how long I need to wait for oath taking ?

There may be COVID-related delays. However, I'd expect sometime between 30-60 days.

Green card holder petition for a minor son?

Yes you may petition for your son. If he turns 21 during the process, the CSPA act may apply.

No, a TN visa holder cannot work in another remote job.

It ultimately depends on the loan company's policies concerning providing loans to officers. If they want evidence of what an I-797 means, you can...

Can I submit I-485 Application for Green card together with form I-131 for Refugee Travel Document?

Yes, you can file the Refugee Travel document if you've been granted asylum.

An immigration attorney in Ukraine should be able to assist you.

How can I do that ? how much is it ?? And how is it going? And what are the chances that everything will work out? And I'm not j

It depends on a number of factors. Consider a private consultation with an experienced immigration attorney who can properly evaluate your options.

How will H4-EAD be affected if I do H1 transfer?

The H1 transfer will have no effect on your EAD.

Can I change the employer ?

Yes, you can change your employer after the Form I-140 is approved.

Every application is adjudicated independently. I don't see any reason to worry.