I saw this question Who will be the first person(s) who enter the paradise? which talks about people going to Jannah (paradise) after the Day of Judgement. The current answers talk about Prophet Muhammad being the first (or among the first) to enter Jannah.
If I've understood the answers correctly, even the Prophet Muhammad has to wait until the Day of Judgement. This has the implication that there is nobody currently in Jannah. Perhaps it exists and is vacant, or it hasn't yet been created.
A hadith was quoted:
Anas b. Malik reported: The Messenger of Allah (ﷺ) said: I will come to the gate of Paradise on the Day of Resurrection. and would seek its opening. and the keeper would say: Who art thou? I would say: Muhammad. He would then say: It is for thee that I have been ordered, and not to open it for anyone before thee. -- Sahih Muslim 197 (sunnah.com)
(I'm not confident if I understood all this correctly.)
Question: Is there nobody in Jannah (paradise) yet?