Sawmiller here. You would want to 'stack and sticker.'

Get some strips of wood 1/2-3/4" thick x 1 to 4 ft long. These can be recycled crate lumber, 1x2s, anything. I've even sliced up scrap OSB on a table saw. It would work fine for 5 weeks. They must be the same thickness, and if not, you must use sets of equal thickness for each layer so the boards will dry straight.

Build a base to keep the lumber off the ground/floor. If on concrete, 2x4s can work. If on the ground, 4x4. They can be 4' long or maybe 6 or 8' depending on how much space you have and how wide and tall you want to make the stack. Lay down several of these parallel to each other. You're going to stack layers on top of them so they must be all in the same plane - a flat surface. This is critical because if the base is not flat, every board will be warped or twisted into that shape. Get on your hands and knees and make sure of it.

The outer two base timbers should be as far apart as your boards are long, no overhang of the lumber. Put one or two spaced evenly in the middle. Usually you want the supports about 2 ft apart, so for 6' boards you'd use 4.

Lay down a single layer of lumber, leaving 1/2-1" between boards for air circulation. Lay down a set of sticks on top to separate from the next layer, each one directly over the base timber below so the weight is transmitted into them. Then another layer of lumber, and so on. The pile will be most stable if the width and height is about equal. The taller it is the more weight there will be on the lower levels which will keep them straight, but too tall and skinny and it can be unstable, especially if it dries faster on one side due to sun.

https://www.google.com/search?q=stack+sticker+lumber&safe=active&rlz=1C1GCEA_enUS944US945&source=lnms&tbm=isch&sa=X&ved=2ahUKEwivpsXZ7-zwAhVNcq0KHdWNB88Q_AUoAnoECAEQBA&biw=1600&bih=757

Plenty of pictures here.

Cover the stack if it's outside, you can use a tarp but it's kind of a pain, but for a few weeks it would be OK. Don't seal it up too much, you want air to come in. Or use some plywood sheets or old barn tin or whatever. Just make sure water runs off the top and not down into the stack. If it rains a bit on the uncovered sides that's OK, the air will re-dry that rapidly.

Add some weight to the top if you can, some bricks or cinder blocks, timbers, whatever you have around. It will keep the upper layers from warping.

Thank you very much Sawmiller, your explanation and instruction is better than my doctor :)

Is it better for humidity and faster drying to stack them up in the garage or the covered lanai? will fans help or is it redundant? keep in mind I live in Florida

Normally PT boards should be aged for 6 months or more after installation before finishing.

Ditto toxcrusadr's advice. I would think you could get by with spacing stickers more than 24" o.c. in this situation. A fan or two would help. Ideally sticker wood would be same as wood being dried as you could get reaction and wood could end up with stripes on the surface. You'll get some drying in 5 weeks.

Thank you all for you advice. I am testing the humidity levels inside the garage compared to outside in the covered lanai to figure out best location to stack/store them. I hope I am taking a good approach !!! oh well we will know in 5 weeks.

Ulisdone, are you suggesting I wait for 6 months before I apply the ReadySeal sealant/stain?

You can stain layer with aniline dye and oil stain .

They do recommend letting a deck age and dry a bit after installation before putting on any kind of sealer. So you might be wondering if you really need to dry it before installation. In this case I think it's a good idea so it doesn't warp from uneven drying. Lumber nowadays is from smaller trees grown very fast and it warps like crazy if drying is not controlled. If they were installing it now, it would be nailed in place and would dry straight.

I would defer to your deck installer as to when it should be stained/sealed based on the moisture content when it's installed.

I doubt there will be a lot of difference between garage and outdoors, unless you hardly ever open your garage. As long as it's out of the rain, either way is fine.