'Make America Great Again': are MAGA monarchists?

Not explicitly, since MAGA and Trump don't have any real policy platforms. It's not principles or ideas - it's a vibe. Ask 10 Trump voters what Trump stands for and you'll get 10 different answers.
But certainly, at least some of Trump's powerful and influential supporters want to move more towards a dictatorial style of government.

Absolutely and unequivocally, yes.
The difference between ’right’ and ‘left’ is frequently over complicated.
What part about ‘no fucking kings’ is difficult to understand?

They are talking like they want to / believe they have an Elective Monarchy:
The Elected Leader is the State and can not be restrained by any officials, government branch, or law
The Elected Leader's actions are legitimate because the elected leader made them
- but if any other leader is elected, it was a SHAM and STOLEN ELECTION! so theyre just fascists who want their xenophobe in chief to reign supreme

No. At least not yet. I don't think they will be because that would entail having any of 47's children succeed him. And I feel like they know they are a shade duller than Hegseth.

Hail King George III
Make America Great-Britain Again!
- The banning of puke flavoured Chocolate will be the first order of business.

No they want their guy in power to make the rules and punish people who they think need punishment.
They think that they will always be the chosen “good people” because they support him and nothing bad will happen to them because of his decisions.
I’m glad Trump went for Tariffs first. These mother fuckers are going to learn with their pocket book what fielty to an unchecked dictator really earns you.
Others are more cynical. They know what Trump is and think they can gain power for their movement. And dominate society I.E. Christian Nationalists.