is 1800 rating any good?

as the title says , is there a chance to get to 2000+? and also when do the rating become stable? i have played around 20 matches but still it didn't stabilize . and last question when do my percentage appear on the leaderboard?

Average on rapid is 800. You're doing great!

"Good" is relative. Is it good compared to an 800? Sure, you will win nearly 100% of the time. Is it good compared to an average NM/FM? Not really - you might win occasionally at best. Is it good compared to an IM/GM? No, you will lose nearly 100% of the time.

Magnus is a god compared to 1800s and is a patzer compared to Stockfish. In relation to the overall rating pool on chess.com, 1800 is in the ~95th percentile (meaning you are better than 95% of players active on the site). Not bad, but there are something like 60,000 people in that group in the rapid rating pool (also keep in mind that many IMs and GMs do not play many rapid games online - especially against random opponents - for the obvious reason that they do not feel like playing Stockfish every other game) so they are not included in the rating pool there.

In terms of when ratings stabilize: the way the Glicko system works, it needs you to play a decent number of games to reduce your rating deviation (RD), but if you are brand new (i.e. no games in a time control before), it won't start stabilizing until you have lost a couple games as it is trying to get you to the level where your opponents would be competitive with you.

My blitz didn't appear on leaderboard until after ~30 games.

I see you play 30|0 games. Not many people play that time control, so not many people will be able to comment on how good your 1800 rating is from experience... no one in this topic so far I assume.

I looked at a few games. They're ok... being "good" is relative as others have said.

ICC used to separate the rating groups by time control.  Did chess.com start doing that and I miss it?  I thought it was just bullet, blitz, rapid, and daily?  30+0 would fall under the rapid rating group (so he would be compared against people who play anything from 10+0 and slower).

Yes, websites have been separating rating by time control for the last few decades, including chess.com

Yes, on chess.com 10|0 is rapid, and so you're correct about the range of time controls in OP's rating category.

Umm... I say most people wont be able to know OP's 1800 from experience because even within a rating category there are differences. For example the people who play 3|0 blitz are essentially in a separate rating pool from the people who play 5|5 blitz since not many people play both.

For example, I see you play 10|0, which is the most popular rapid time control (and maybe the most popular time control overall).

If you switched to 30|0 it wouldn't be a surprise if your rating went up or down 1 or 2 hundred points.

Same for me, if I switched to a very different blitz time control my rating would probably change.

I think it's good 

I meant they have separate 3+0, 5+0 5+5, etc pools.  Chess.com has always grouped them as just blitz (for this example).  I wasn't sure if I missed a beta announcement that they were splitting them up.  In many ways, it would be nice because you are correct:  being 1800-2000 in 10+0 is very different from 30+0 or 45+45.  But alas, I use it to work on my openings and tactical vision, so I'm not sweating it.  My OTB rating is the only one I really care about.

Oh, yeah, the no escape "pools" on ICC. They were more competitive... that would be a fun addition here... although they moved 10|0 out of blitz, so I don't think it would be much of a difference.