I've tried some things without success, I don't have recent experience with grub, multi-boot and UEFI. I think @wizardfromoz may have be able to help you out since he is the king of multi-boot.
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set prefix=(hd0,gpt3)/boot/grub
insmod normal
normal
nvme0n1 259:0 0 476.9G 0 disk
├─nvme0n1p1 259:1 0 498M 0 part /boot/efi
├─nvme0n1p2 259:2 0 4G 0 part /recovery
├─nvme0n1p3 259:3 0 393.9G 0 part /run/timeshift/backup
├─nvme0n1p4 259:4 0 16M 0 part
├─nvme0n1p5 259:5 0 74.5G 0 part
└─nvme0n1p6 259:6 0 4G 0 part
└─cryptswap 253:0 0 4G 0 crypt [SWAP]
nvme1n1 259:7 0 27.3G 0 disk
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
#PARTUUID=5142cec2-d485-4563-8c75-a5cf4bbd3d5e /boot/efi vfat umask=0077 0 0
PARTUUID=9a9854ec-afad-41c6-aa7e-cb438532e499 /recovery vfat umask=0077 0 0
UUID=3fe5911f-18d3-456f-9f71-6a27e3eb8b62 / ext4 noatime,errors=remount-ro 0 0
/dev/mapper/cryptswap none swap defaults 0 0
#UUID=5100-A6CA /boot/efi vfat defaults 0 1
#UUID=5100-A6CA /boot/efi vfat defaults 0 1
#UUID=5100-A6CA /boot/efi vfat defaults 0 1
#UUID=5100-A6CA /boot/efi vfat defaults 0 1
UUID=5100-A6CA /boot/efi vfat defaults 0 1
BootCurrent: 0000
Timeout: 1 seconds
BootOrder: 0002,0001,0000,0003
Boot0000* Pop!_OS 21.04
Boot0001* UEFI OS
Boot0002* pop
Boot0003* Windows Boot Manager
nvme0n1p3 is time shift according to your partition and mount point setup.nvme0n1p3 is Linux
nvme0n1p5 is Windows
ls /run/timeshift/backup
GRUB_TIMEOUT=10