Current Bitcoin Mempool

https://mempool.observer/#current-mempool

This graph shows an image in real time, it contains the unconfirmed transactions that are waiting to be included in the block to confirm, here you will see your transaction according to the rate that has been paid, if the transaction has a very low rate it will be at the bottom of The image awaiting confirmation, if the payment rate is higher the confirmation will be confirmed faster and will be at the top of the image, to know the status of your transaction insert your operation and it will be reflected in the color scale of the graph and You will have a clear vision of where it is at all times.
 

Mempool Statistics

https://jochen-hoenicke.de/queue/#0,24h

If you have to make a transaction or have to receive a payment, this graph from Johoe's Bitcoin Mempool Statistics is what you need to check, it is one of the most explicit graphs to know if the mempool is overloaded, We check our wallet and the transaction does not finish confirm or it is very slow because the network is saturated, looking at this page we will quickly clear up any doubts and see if the delay is due to excessive traffic of transactions pending confirmation.

You can check the data for Bitcoin and for other currencies, on the same page you have other graphs to see, Pending Transaction Fee in BTC, Mempool Size in MB.

Unconfirmed Transactions

https://www.blockchain.com/en/charts/mempool-count 

In the mempool, all valid transactions wait to be confirmed by the Bitcoin network.
The greater the number of transactions to be confirmed in the mempool means that there are many transactions waiting and the confirmation time will be longer, increasing the fees.