Hi there,
Thank you for reaching out. In addition to the suggestion shared by @marliton, I would advise you to confirm with the client if they need artwork for a specific tablet or iPad or a generic tablet resolution as there are different sizes, aspect ratios, and resolutions of iPad and tablets available in the market. For example: iPad 9 generation has 1620 x 2160 resolution, 4:3 aspect ratio whereas Samsung Tab 7 has 1600 x 2560 pixels, 16:10 ratio and iPad mini 6 generation has1488 x 2266 pixels, 3:2 aspect ratio. So, make sure you are designing artwork for the right resolution and aspect ratio. Once artwork is finished, it will be hard to resize it to a specific size as your artwork will not fit even you scale it. I hope it helps!
Regards,
Anshul Saini