From: https://support.apple.com/en-us/HT202351

On Mac computers with Apple silicon, you can connect up to 5 displays depending on the chip in your Mac. 

To find out which chip your Mac has, choose Apple menu  > About This Mac. 

If you're using a Mac Studio with M1 Ultra:

You can connect up to five external displays to your Mac using the Thunderbolt 4 (USB-C) and HDMI ports on the front and back of the computer.

If you're using a Mac with M1 Max:

On MacBook Pro, you can connect up to four external displays to your Mac using the Thunderbolt 4 (USB-C) and HDMI ports.

On Mac Studio, you can connect up to five external displays to your Mac using the Thunderbolt 4 (USB-C) and HDMI ports on the back of the computer.

If you're using a Mac with M1 Pro:

You can connect up to two external displays to your Mac using the Thunderbolt 4 (USB-C) and HDMI ports.

If you're using a Mac with the M1 chip:

On iMac, Mac mini, MacBook Air, and 13-inch MacBook Pro, you can connect one external display using either of the Thunderbolt / USB 4 ports. 

On iMac, connect your display to either of the ports with the Thunderbolt symbol .

On Mac mini, you can connect a second display to the HDMI port.

Using docks or daisy-chaining devices doesn't increase the number of displays you can connect.

If you're using a Mac with the M2 Pro or M3 Pro chip

Up to two displays, both Thunderbolt, or one Thunderbolt and one HDMI

If you're using a Mac with the M2 Max or M3 Max chip

Up to four displays, all Thunderbolt, or Thunderbolt with up to one HDMI